Bruno Mars & Rita Ora
Before Rita broke Rob Kardashian's heart, she was head-over-heels in love with Bruno Mars. "It was love at first sight, such a great experience," she confesses. "We met in 2009. I was 18 and starting out at Roc Nation. Bruno was unknown back then, too. He was a struggling songwriter hired to write songs for me. I thought, 'Wow, that's just the world's greatest guy!''' And though it ended in 2011, the two still care for each other. "Our time together was wonderful. But once we got famous, work got in the way. We ended it last year. But we remained close. And when we were together, we were so happy." Now, let's play detective and figure out which songs he wrote about Rita!