Rihanna stepped out in New York in one of her most revealing daytime looks yet – as she continues to rebel against handlers who have been urging her to tone down her wild behavior. 
 
 The singer was seen shopping in SoHo in a revealing, and see-through, tiny pink strapless bra with a pleated skirt, showing off her flat stomach and toned arms. 
 
 The star, who matched her look with Converse sneakers, sunglasses and bright yellow talon nails, wandered around the SoHo shops with girlfriends before heading to Da Silvano for an early dinner. 
 
 She cancelled a trip to the UK last week insisting she needed to spend more time with her family and her grandmother, Dolly, who is suffering from cancer. She was spotted catching the Miami Heat game on Saturday at 40/40 with her family, including her grandfather, and her group was later joined by her ex Chris Brown. Rihanna and Brown later headed with their respective entourages to Meatpacking hotspot SL. 
 
 While sources told the UK’s Closer Magazine that Rihanna’s friend and manager Jay-Z has ordered her to “go to rehab,” sources tell Page Six that this is not the case, and the real issue is that Rihanna is at the center of a management struggle at Roc Nation about how to deal with her rebellious behavior, and refusal to stay away from Brown. 
 
 One source told Page Six, “Rihanna feels she has worked hard, and rightly deserves to enjoy her huge success. She has rebelled against her management and her record label execs who want her to tone her lifestyle down and work more. She has been taking more vacations, wearing more wild outfits, posting more on Twitter. Her message is that she’s an artist, and will live her life how she likes.” ||||| Actress/Singer Rihanna attends the Los Angeles premiere of "Battleship" at Nokia Theatre L.A. Live on May 10, 2012 in Los Angeles, California. Credit: Kevork Djansezian/WireImage.com 
 
 Rihanna is running herself ragged. 
 
 The unattached, "Where Have You Been" singer, 24, is at work on her seventh CD -- and trying to squeeze in some more zzz's! Recently, she opened up to Us Weekly about her jam-packed calendar -- and the effect it's having on that famous beach bod. 
 
 PHOTOS: Rihanna's sexy bikini bod 
 
 Recently, the pop diva made the leap from the recording studio to the big screen with her star turn in Battleship. "I want to do two more [movies] before touring again next year," Rihanna gushed to Us of her filming experience, even though, "My schedule is crazy!" 
 
 So crazy, in fact, that the Barbados-born beauty was hospitalized for fatigue following her appearance at the Met Ball last month, where she stunned in a black, reptile-inspired Tom Ford gown. 
 
 "I got no sleep [beforehand]," Rihanna explained. "It's harsh on your body!" 
 
 PHOTOS: Rihanna, then and now! 
 
 Her hospitalization -- and her shrinking bod -- have some fans fretting that she's dealing with something more serious, though Rihanna assures Us her nonstop schedule is the only thing to blame. 
 
 "I'm a size 0 -- and not happy about it!" she says. "I went way too far. I prefer myself a bit chunkier. I want my old butt back!"
– Rihanna's derriere isn't as ample as it once was, and the singer doesn't like that fact. "I'm a size 0—and not happy about it!" she tells Us Weekly. "I went way too far. I prefer myself a bit chunkier. I want my old butt back!" The 24-year-old lays the blame on her crazy schedule, which apparently has her losing out on sleep ... and landed her in the hospital post-Met Ball. "It's harsh on your body!" she says of her jam-packed life. And her run-yourself-ragged approach has many worried she's falling apart. Chris Brown and Drake apparently don't mind the size of Rihanna's booty; click for the latest on their reported bar brawl over the singer.