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 Rihanna dramatically fell ill — again — after the Costume Institute gala at the Metropolitan Museum of Art Monday night, needing an IV drip to nurse her back to health Tuesday. 
 
 The pop star attended the gala event in a form-fitting Tom Ford black crocodile dress and mingled with Sarah Jessica Parker, designer Valentino, Rick Ross and others. 
 
 The “We Found Love” singer posted a photo of herself on Twitter Tuesday with an IV in her arm — and her party nails still in place. 
 
 PHOTOS: 
 
 
 
 RIHANNA 
 
 
 
 2012 COSTUME INSTITUTE GALA 
 
 
 
 CELEBRITY FASHION AT THE MET BALL 
 
 
 
 ANNA WINTOUR’S MANY MET BALL LOOKS 
 
 While it was first reported to be “dehydration,” a source tells us she became sick from, “excessive partying and not slowing down. She has been traveling nonstop and going wild. Rihanna has been rebelling against her record label because she feels she has been made to work too hard.” 
 
 The singer was not spotted at the Met after-parties at Crown, the Prada bash, or the late-night revel at the Top of the Standard. But she was photographed at a Carlyle fete hosted by Cameron Diaz and Gwyneth Paltrow. 
 
 Rihanna’s IV incident followed her “SNL” appearance, where the singer claimed she was sick and refused to perform during a dress rehearsal Saturday evening, which is required for cast members and musical guests. 
 
 “SNL” creator Lorne Michaels told The Post it was the first time a musical guest didn’t make the rehearsal. “Rihanna did not do the dress rehearsal because of her throat, which was the first time that’s ever happened,” he said. “I think for the live audience, when they heard that — we announced it just before she would have gone on — that also sort of took the air right out of the room. It was a very difficult dress [rehearsal] to gauge.” 
 
 As reports broke of Rihanna’s medical emergency, so did news she’ll perform on the May 23 season finale of “American Idol.” 
 
 A source close to Rihanna said, “She’s doing great now. She was super sick. She got some penicillin and an IV, and is better.” Her rep had no comment. ||||| Katy Perry has never shied away from a risky, rule-breaking fashion moment. Which is why, with her fearless approach to red carpet dressing, she was a perfect choice to co-host this year’s gala honoring Comme des Garçons’ Rei Kawakubo and her otherworldly, body-deforming designs. 
 
 After all, this is a woman who, for the last gala bleached her eyebrows into oblivion just to give herself that extra alien effect (and then added a Tamagotchi for good measure). This year, the pop star left her brows fully intact but otherwise doubled down on the OTT red carpet dressing, going even bigger in a custom Margiela gown and headpiece. 
 
 The “Chained to the Rhythm” singer chose to wear a Maison Margiela ‘Artisanal’ piece designed by John Galliano for the big night, slightly altered from a look that appeared on his 2017 Couture runway, composed of a red décortiqué embroidered wool coat layered over a red tulle and silk chiffon dress with embroidered satin ribbon embellishment. She paired her ensemble with a long red silk tulle veil that appears to be embroidered with the word “witness” that trailed out behind her, a headpiece in high polished chrome with spring, mirror and decorative ornaments and red Tabi boots, a signature of the house. 
 
 ❤️ #details #metball #KatyPerry A post shared by Jamie Mizrahi (@sweetbabyjamie) on May 1, 2017 at 3:00pm PDT 
 
 She also added on some Kawakubo-approved details with her nail art which featured evil eyes and jewels, which she paired with some enormous diamond rings courtesy of Lorraine Schwartz. And while she isn’t wearing the designer of the evening on the red carpet, the singer will reportedly be changing into a Comme des Garçons look for her private performance inside the Gala dinner. 
 
 Last year’s look was also very topical and equally dramatic, as Perry attended the Manus x Machina exhibit in a custom Prada gown festooned with steampunk embellishments like clocks and gears. 
 
 RELATED PHOTOS: All of the Comme des Garçons Looks We Want to See on the Met Gala Red Carpet 
 
 And while the gowns from the two years prior weren’t exactly in line with the gala theme, they were unquestionably daring. 
 
 Katy attended the “China: Through the Looking Glass” gala in a custom faux-spraypainted gown designed by Moschino’s Jeremy Scott complete with spray paint can handbag and charms dangling off her nails that spelled out the brand’s name. Prior to that, the singer arrived on the “Punk”-themed red carpet in a full Dolce & Gabbana look fit for a queen and a fully illuminated gown by Cute Circuit in honor of the museum’s “American Woman” exhibit. 
 
 What do you think of Katy’s Met Gala look? Which look from the past was your favorite? Sound off below! ||||| Jay Z and Beyonce at the 2014 Met Gala. (Evan Agostini/Invision/AP) 
 
 The Met Gala has always been a very elite, very New York City affair, but it sure took a leap into the mainstream last year: Post-gala, security cameras captured singer Solange attacking her brother-in-law, Jay Z, in a hotel elevator while Beyoncé calmly adjusted her dress in the background. 
 
 The annual fashion benefit takes place Monday night, so we’ve got your primer on what to expect, including if anything can possibly top last year’s drama. 
 
 [Beyoncé, Jay Z and Solange speak out about elevator video: ‘Families have problems and we’re no different] 
 
 What exactly is the Met Gala? 
 
 Also known as the Metropolitan Museum of Art’s Costume Institute Gala, the extremely fancy, exclusive event is held every year to raise money for the institute and kick off the new spring exhibit. According to the New York Times, it “has become, over the last decade, the undisputed party of the year on the New York social schedule” and costs roughly $25,000 a ticket. 
 
 What’s this year’s exhibit? 
 
 The 2015 exhibition — also the costume theme for the evening — is called “China: Through the Looking Glass.” According to the museum’s announcement, it “will explore the impact of Chinese aesthetics on Western fashion and how China has fueled the fashionable imagination for centuries.” 
 
 Anna Wintour (Jordan Strauss/Invision/AP) 
 
 Who’s hosting? 
 
 Vogue editor Anna Wintour, who regularly runs the show, and whom the Times credited as “the driving force behind the gala’s transformation from a well-attended dinner for museum donors and patrons into one of the biggest fund-raising events staged by any of the city’s cultural institutions.” Her co-hosts include actresses Jennifer Lawrence and Gong Li; Yahoo! CEO Marissa Mayer and executive Wendi Murdoch. 
 
 [From Jay Z and Solange to Rep. Vance McAllister, how does security footage get leaked?] 
 
 Who’s invited this year? 
 
 In addition to all the top designers, the full list of celebrities is as overwhelming as ever, including Anne Hathaway; Claire Danes; Colin Firth; Bradley Cooper; Jessica Chastain; Spike Jonze; Julianne Moore; Sarah Jessica Parker; Rita Ora; Reese Witherspoon; Neil Patrick Harris; Ryan Reynolds and Blake Lively; and of course, Kim Kardashian and Kanye West? 
 
 Why “of course” Kim and Kanye? 
 
 Because who wouldn’t invite those two back after this fashion statement during the year of the “punk” theme? 
 
 
 
 Kim and Kanye (Justin Lane/EPA) 
 
 So what was all the drama last year? 
 
 Solange and Jay Z had some sort of family feud that led to the fight footage seen around the world, thanks to TMZ. They later released an apology statement (“At the end of the day families have problems and we’re no different. We love each other and above all we are family. We’ve put this behind us and hope everyone else will do the same.”) and never really explained what happened, though rumors were rampant. 
 
 [Solange predictably plays down Jay Z elevator fight in new interview] 
 
 Wasn’t there something else that happened in an elevator? 
 
 Well, supermodel Cara Delevingne posted a Instagram video that pictured a group of models and starlets goofing off in an elevator, something mere mortals usually never get to see. The highlight: Reese Witherspoon dispensing baby name advice in a Southern drawl. “The most important thing in a name for a girl? That a man can whisper it in his pillow.” It was unfiltered and hilarious — and obviously pulled from Instagram immediately. 
 
 Can we expect more madness? 
 
 You never know, but probably nothing like last year — security everywhere will likely be under lots of pressure not to let any incriminating footage leak, though it’s hard to control such things. Plus, filmmaker Andrew Rossi will be there filming for a documentary, so stars will be on their best behavior. Though Delevingne is attending again, so maybe she’ll film more entertaining scenes and not cave to peer pressure to delete them. 
 
 READ MORE: 
 
 That Reese Witherspoon Instagram video has already been deleted. Why are stars so afraid to show off their real personalities? 
 
 The Met Gala: One designer’s gowns steal the show 
 
 At the Met Gala, a red carpet like no other ||||| Priyanka Chopra attends The Metropolitan Museum of Art's Costume Institute benefit gala celebrating the opening of the Rei Kawakubo/Comme des Garçons: Art of the In-Between exhibition on Monday, May 1,... (Associated Press) 
 
 Priyanka Chopra attends The Metropolitan Museum of Art's Costume Institute benefit gala celebrating the opening of the Rei Kawakubo/Comme des Garçons: Art of the In-Between exhibition on Monday, May 1, 2017, in New York. (Photo by Charles Sykes/Invision/AP) (Associated Press) 
 
 NEW YORK (AP) — The color red made a dramatic show Monday night in the grand parade of fashion at the Met Gala, including co-chair Katy Perry's look, as did glittery gold and blue feathers on the back of Blake Lively. But many of the evening's highlights were courtesy of luminaries who channeled honoree Rei Kawakubo, including Rihanna encased in fluttery petal-like pieces by the Japanese designer. 
 
 Rihanna gestured to the crowd from the carpet in her Commes des Garcons look with stagey pink on her cheeks. Her look was two pieces and a sliver of stomach peeked out from the freewheeling design. 
 
 Perry wore a veiled dress created just for her by John Galliano, while Pharrell's wife, Helen Lasichanh, wore one of Kawakubo's avant-garde, bulbous and armless jumpsuits. Lively's movie star gown with the feathered train was Versace. 
 
 While some of the celebs from the worlds of film, TV, fashion, sports and music were inspired by Kawakubo, others made a splash in more classic looks, including Jennifer Lopez in 1950s elegance, a baby blue Valentino gown by Pierpaolo Piccioli. 
 
 Perry wore a silver head piece and black accents around the eyes with an embroidered wool coat layered over a red tulle and silk chiffon dress, her sleeves elongated in a nod to Kawakubo, all by Maison Margiela Artisanal. 
 
 Music mogul Diddy, meanwhile, laid down on the carpet to watch girlfriend Cassie pose in a black gown with a huge, spikey train she wore with large, glittery ear cuffs. He wore an embellished cape in a spider web design that carried over to his Rick Owens tuxedo. 
 
 "It took a half-hour to get ready. We dress like this on the weekends," he joked. 
 
 Speaking of the weekend, Selena and her date — The Weeknd — smooched on the carpet in a classic white, delicately embellished gown from Coach designer Stuart Vevers. Madonna went for green camo from Moschino, Tracee Ellis Ross in royal blue Comme des Garcons and Kim Kardashian West — without husband Kanye West — in understated, long-sleeve white from Vivienne Westwood. 
 
 Nicki Minaj, in a black bustier romper with a huge black-and-red cape from H&M, is a pro when it comes to arrivals. 
 
 "I stood up in the van the whole way," she said of her trip to the Met in her larger-than-life ensemble. 
 
 Missing from the carpet: Stalwarts Sarah Jessica Parker, Beyonce and Lady Gaga. 
 
 Serena Williams in green Versace put in her first carpet appearance since announcing her pregnancy. Kylie Jenner was whisked up the stairs in a revealing sheer gold Atelier Versace gown, her platinum locks styled closed to her head. Sister Kendall Jenner stunned in a revealing black look covered in 85,000 hand-painted crystals from La Perla Creative Director Julia Haart. It included a wide diagonal slit from shoulder to below the waist and took more than 160 hours of work by 26 craftsmen in five cities, the designer said in a statement. 
 
 Lasichanh, her blond hair high on her head, smiled from within her signature Kawakubo suit. Claire Danes also channeled the Japanese designer, whose work is featured in the Metropolitan Museum Costume Institute's spring exhibition, "Rei Kawakubo/Comme des Garcons: Art of the In-Between." The sleeves of Dane's flurry of ruffles in a white blouse extended well beyond her hands, paired with a simple pair of black pants. 
 
 Vogue's Anna Wintour kicked off the star-studded gala a bit earlier as one of the evening's co-host. The gala feeds the annual budget of the Costume Institute. Wintour opted for encrusted gold and ostrich feathers from Chanel and said of Kawakubo and her brand: "She's a genius. Not only does she think outside of the box, she doesn't acknowledge the box." 
 
 Priyanka Chopra's floor-sweeping trench coat evening gown in camel from Ralph Lauren took up a lot of real estate on the carpet, which is actually blue this year. Gigi Hadid went with the color fawn in a geometric design that was short on one side and longer on the other. Her sister, Bella, dressed in a sexy sheer catsuit by Alexander Wang. 
 
 Thom Browne dressed Solange Knowles in a black coat dress, a quilted down-filled puffer with a train and a pair of his ice skate-inspired booties on her feet. 
 
 Lilly Collins, her hair in a black, banged crop with dark red lips, paid homage to Kawakubo in a black strapless bodice paired with a high-waisted full skirt in pink, from Giambattista Valli. Zendaya, was just Zendaya, her hair down and red parrots adorning a full, off-the-shoulder ball gown in gold by Dolce & Gabbana Alta Moda. 
 
 Celine Dion, in a silver bodysuit by Versace paired with high hair sculpture, was the last to walk, praising Kawakubo and saying: "To wear something, to be recognized, the whole thing is overwhelming. It's great to be here." ||||| Oof. 
 
 A lot of stars shined at the Met Gala, but others just missed the mark. 
 
 Among the fashion casualties were Maggie Gyllenhaal and Jennifer Connelly, who were going for wonders in white, but instead just fell flat. 
 
 Sorry, ladies, but it's true. 
 
 Jennifer Connelly donned a lace Louis Vuitton sheath dress on this year's red carpet. 
 
 While we appreciate the effort, that leg-of-mutton sleeve made the ensemble look far too big for her tiny frame. And as if that wasn't enough, her hands were practically swallowed up in that dress. 
 
 The Blood Diamond actress ended up looking like a little girl trying on mommy's clothes. 
 
 And poor Maggie! 
 
 She tried in that floor-length Roland Mouret number, we just aren't exactly sure what it was she was trying for. 
 
 From the different-sized straps, to the world's weirdest waist accent, we have no other word's to describe Maggie's red carpet outfit than a hot mess. 
 
 But Jake Gyllenhaal's big sis did succeed at something: reminding us why wearing black and brown together was a fashion faux pas to begin with! 
 
 [Images via Getty Images.] 
 
 Tags: fashion smashion, jennifer connelly, louis vuitton, maggie gyllenhaal, met gala, red carpet, roland mouret ||||| From left: Rose Byrne in Ralph Lauren, Rihanna in Comme des Garcons and Rita Ora in Marchesa at the 2017 Met Gala. 
 
 Red was a popular choice on Monday night, a nod to Kawakubo's use of the color. 
 
 When the dress code calls for "avant-garde," you know it's gonna be good — or bad, or in this case, both. For lord's sake, Jaden Smith carried his own freshly shorn dreadlocks in his hand as an accessory (now that's avant-garde), while Bella Hadid wore what amounted to a sheer bodystocking (unclear on the concept). 
 
 For the record, avant-garde is defined as new or experimental, and the Met Gala red carpet, otherwise known as the Oscars of fashion, had some of that, including silver hair, red eyeshadow and clothing that looked like art in motion. 
 
 The annual fundraiser for the Metropolitan Museum of Art Costume Institute, hosted by Vogue magazine in celebration of Rei Kawakubo, the avant-garde Japanese designer of Comme des Garcons, drew a who's who of Hollywood and fashion Monday night, including co-hosts Katy Perry, Gisele Bundchen and Tom Brady. 
 
 Guests struggled with the theme, trying to pay tribute to Kawakubo's work, which explores such heady themes as the relationship of clothing to the body and the concept of women as objects. The Met's exhibition, "Rei Kawakubo/Comme des Garcons: Art of the In-Between" opens Thursday and runs through Sept. 4. 
 
 It was not a good night for reality show royalty: Kim Kardashian's white gown by punk goddess Vivienne Westwood was a snore, and Kendall Jenner attempted to revive a trend that's so three years ago — the naked dress, wearing a sloppy look by La Perla. Gigi Hadid, who has now collaborated with Tommy Hilfiger on two runway collections, wore a custom, deconstructed satin and tulle jacket-dress hybrid by the designer who is known for sportswear for good reason. 
 
 Interestingly, very few guests actually wore Comme des Garcons, except for co-host Pharrell Williams, who rolled up in punk ripped jeans, a plaid shirt and biker jacket; his wife Helen Lasichanh in a red jumpsuit that distorted her form (Rei handpicked it, she noted); Tracee Ellis Ross in a sculptural blue Comme des Garcons coat; and former ambassador to Japan, Caroline Kennedy, who got to know the designer when she was posted in Tokyo, wearing a brave floral tent. 
 
 But they were all bested by queen of the night, Rihanna, who did Rei proud by wearing a fall 2016 dress from the designer’s Comme des Garcons runway. The pouf-ball of a dress was an assemblage of petals of fabric, both precious and mundane, which made Rihanna look like a walking fashion retrospective herself. It was a joy to look at, worn with fire engine red gladiator sandals that wrapped up her legs, lending some sex appeal to the curve-defying look. 
 
 Red was a popular choice Monday night, a nod to Kawakubo's penchant for using the strong color ("red is black," she has said). Rita Ora was wrapped up like a gift in sculptural red bows over a pale pink tulle skirt, a custom gown by Marchesa. 
 
 Rose Byrne wore the sexiest Ralph Lauren look I can remember seeing ever, a bodysuit with a deep, deep V decolletage and side cutouts, with a tulle skirt. The other Lauren looks on the carpet felt a bit forced, including Priyanka Chopra'’s extra, extra-long trench gown with train and Dracula-like collar. 
 
 Claire Danes kept with the avant-garde theme, wearing a sculptural white blouse and pants by Laura Kim and Fernando Garcia, the designers behind the new American label Monse, who have led the trend of the chic shirt. They also head up Oscar de la Renta, and they scored a win for that house, too, dressing Zoe Kravitz in a pale pink and black caped gown, a classic-looking style that she managed to make modern with her new closely cropped 'do. 
 
 Another designer who was well-represented (and represented the theme well) was Thom Browne, longtime partner of exhibition curator Andrew Bolton. Solange chose one of Browne's fall 2017 runway looks, a black puffer coat dress, and even wore it as it came down the runway, with a pair of ice skates on her feet. Fashion editor Amy Fine Collins wore one of his masculine-meets-feminine looks, similar in spirit to the custom coat dress he made for Michelle Obama's 2013 inaugural look. 
 
 Cara Delevigne chose a belted spring 2017 Chanel couture pants look, but it was her silver hair that caused a stir, an homage to similar silver foiled looks that have appeared on the Comme des Garcons runway. 
 
 Several attendees referenced Kawakubo's avant-garde spirit in their beauty looks (Kerry Washington's black bob, Sasha Lane's hot pink eyeshadow and Cynthia Erivo's cotton candy-like hair), which was a smart way of nodding to a theme, instead of resorting to a poor imitation.
– The Met Gala was last night, meaning celebrities had a chance to dress up in totally crazy outfits and vie for headlines the next day. Six of the most talked-about costumes: Beyonce showed up—two hours late—in a mostly see-through (with the exception of some well-placed ... confetti?) dress, prompting USA Today to declare, "Beyonce has a rare (but epic) fashion fail," even referring to it as a "Kardashian-like moment." Sarah Jessica Parker wore a headdress that was supposed to look like flames, and People notes that it's already a meme—people are comparing it to a flame emoji, the Human Torch, the hair of the Heat Miser from classic cartoon The Year Without a Santa Claus, and even the hat Jafar wears in Aladdin, among other things. Bey's sister, Solange Knowles, wore her own bizarre dress. It's difficult to describe, but People notes that the printed dress with mini-pleats "looks like two paper fans on top of each other." Vanity Fair declares that Rihanna "won" the red carpet with her insane yellow dress, complete with fur cape dragging an enormous train behind it. "I can’t really walk in it without any help," Rihanna explained. "But it’s so worth it. I love this dress so much!" Jennifer Connelly wore a Louis Vuitton sheath dress with puffy sleeves, and Perez Hilton complained that "that leg-of-mutton sleeve made the ensemble look far too big for her tiny frame. And as if that wasn't enough, her hands were practically swallowed up in that dress," making her look like "a little girl trying on mommy's clothes." As for Anne Hathaway, she looked vaguely like a Star Wars character in her gold, hooded ensemble, a not-uncommon observation. E! also notes that it "somewhat resembles a metallic boxing robe a pro athlete might wear." If you don't fully understand the Met Gala, the Washington Post's amusing FAQ may help. It reminds us, for one thing, that this happened after last year's event.