It's Over: The Biggest Celebrity Breakups of 2014

John and Katy called it quits for good in February after dating on and off for two years. A source told Us Weekly at the time, "She's stressed about the tour. They've been fighting. It is probably for the best, because she is going to be on tour for forever. Of course, this happens all the time; I can't keep track anymore. But for now, they are done."