The Breakup, starring Jennifer Aniston and . . . Courteney Cox? 
 
 Although the actresses have been best friends through thick and thin since the 1994 debut of, er, Friends on NBC, they haven't been photographed together in nearly a year. 
 
 PHOTOS: Jen and Courteney friendship -- a timeline 
 
 "There's tension" between Aniston, 42, and Cox, 46, one source confirms in the new Us Weekly, out now. 
 
 What could possibly threaten such a close-knit friendship? Cox's trial separation from hubby David Arquette as she hangs with sexy Cougar Town costars Brian Van Holt and Josh Hopkins. 
 
 PHOTOS: Shocking best friend breakups 
 
 "Jen thinks Courteney is acting callous by running around with this guy but refusing to file divorce papers," an Aniston source says. "Like she's playing mind games with David." (Cox and Arquette announced their trial split in September 2010 after 11 years of marriage.) 
 
 Cox's post-separation antics with her costar even reminded Aniston of her own marital heartache with ex Brad Pitt, who took up with Angelina Jolie weeks after their 2005 split. 
 
 PHOTOS: A look back at Brad and Jen's good old days together 
 
 "She hates watching Courteney do the same thing," the source says. 
 
 Can this friendship be saved? Read more about this shocking rift in the new Us Weekly -- on stands now. ||||| Click to email this to a friend (Opens in new window) 
 
 Former “Friends” star Courteney Cox is preparing to marry Snow Patrol guitarist Johnny McDaid after less than a year of dating, sources tell Page Six. 
 
 We’re told that Cox, 49, and McDaid, 37, have discussed getting engaged, and her close friends, including Jennifer Aniston, couldn’t be happier, because they all love him. 
 
 One source said, “Johnny loves her daughter Coco, and he wants to marry Courteney. They have discussed getting engaged and everyone thinks it is going to happen.” 
 
 The source continued, “She met Johnny through Ed Sheeran, who is friends with Jen Aniston. All of Courteney’s friends love Johnny, which is great because Jen wasn’t so fond of David Arquette,” Courteney’s ex-husband, with whom Courteney has remained on very good terms after their divorce. 
 
 The couple was first seen out together in December 2013, when they attended Aniston’s holiday party in Los Angeles. 
 
 This week, Cox and McDaid were spotted looking loved-up as they took a hand-in-hand beach stroll in Malibu, stopping to wrap their arms around each other and kiss. 
 
 The “Cougar Town” actress — who divorced Arquette in May 2013 after 14 years of marriage — recently said of her relationship with McDaid, “I couldn’t be happier.” 
 
 She also praised Johnny after he wrote three original songs for her movie directorial debut, “Just Before I Go.” On the red carpet at Manhattan’s SVA Theatre for the April 24 premiere of the film, she said, “He supports me in every way . . . He supports me creatively. He really believed in the movie . . . and not just because he likes me, though I know that helps.” 
 
 McDaid also said of Cox, “She gets music. She gets art. She gets the way a scene gets constructed, the way dialogue works. And she puts it all together in her mind and then explains it to the world and makes movies that make people laugh and cry, squirm and jump, all those things.” 
 
 Her rep didn’t comment Wednesday night. ||||| Click to email this to a friend (Opens in new window) 
 
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 Courteney Cox and David Arquette lived an “open marriage” in the months before their sudden and shocking split, according to multiple sources close to the pair. 
 
 Cox, 46, was linked to Cougar Town co-star Brian Van Holt, while Arquette, 39, was often spotted behaving like a wild and crazy single man, at hotspots around Hollywood. 
 
 PHOTOS: 2010 Celebrity Splits 
 
 A source on set at Cougar Town told RadarOnline.com: “Courteney and Brian were all over each at a wrap party in April and the talk on the set was that it was fine because she and David had an open marriage.” 
 
 In May, Cox and Van Holt were even spotted out together four times in less than four weeks. 
 
 PHOTOS: Celebrity Power Couples 
 
 On one occasion, they were photographed at Malibu’s Coral Beach Cantina without her husband of 11 years and their six-year-old daughter, Coco. 
 
 “They were drinking beer and having chips and salsa in the back of the outdoor patio,” said one eyewitness at Coral Beach Cantina, on May 7. 
 
 PHOTOS: Courteney In A Bikini Filming Cougar Town 
 
 “They looked like they were holding hands at the side of their table.” 
 
 While Courteney was enjoying the success of the ABC sitcom Cougar Town, a program she executive produces, it emerged Arquette begun “acting out” and “going out for nights” without his wife. 
 
 PHOTOS: Courteney Cox Real Or Fake? Bikini Body Wars 
 
 The Friends beauty and David — who married in 1999 after meeting while filming the 1996 thriller Scream — announced Monday that they had separated. 
 
 In a statement, the couple said: “The reason for this separation is to better understand ourselves and the qualities we need in a partner and for our marriage. 
 
 PHOTOS: Courteney And David Together 
 
 They added, “We remain best friends and responsible parents to our daughter and we still love each other deeply. 
 
 “As we go though this process we are determined to use kindness and understanding to get through this together. 
 
 PHOTOS: Courteney Filming Cougar Town 
 
 “We are comfortable with the boundaries that we have established for each other during this separation and we hope that our friends, family, fans and the media also show us respect, dignity, understanding and love at this time as well.” 
 
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– Friends stars Jennifer Aniston and Courteney Cox have been famous for being real-life friends ever since the show debuted in 1994. So why haven't they been photographed together in almost a year? Sources tell Us "there's tension" between them, and not because Courteney had dinner with Brad Pitt last month. No, it stems from Cox going out on the town with her male costars during her trial separation from hubby David Arquette. "Jen thinks Courteney is acting callous by running around with this guy but refusing to file divorce papers," an Aniston source says. "Like she's playing mind games with David." The source adds that the whole thing reminds Jen of her own ex-husband taking up with Angelina Jolie after they split: "She hates watching Courteney do the same thing." But click here for a report that Jen recently introduced her new boy toy to friends ... including Cox.