Three of Hollywood’s biggest heartthrobs are withering away and so much so a mutual friend of the trio secretly fears they’ve become manorexics! Indeed, Brad Pitt, Johnny Depp and George Clooney have all shed so much weight their good looks have obviously faltered! “Brad showed up to a premiere looking gaunt,” a source confided. “Clearly, he’s losing sleep — and weight — over his split from Angelina Jolie.” Meanwhile, the pal attributed Johnny’s scary slim-down to his rough-and-tumble divorce from Amber Heard, saying: “Johnny looks like he could use a nourishing meal. He’s dreadfully thin!” Finally, the insider said: “George is so nervous about becoming a dad he’s losing weight — and too much of it. “It’s one thing to trim down, but these guys are skin and bones!”