As chairman and CEO of Bad Boy Records, Diddy is the most powerful person at the label. But that doesn't mean he doesn't come down and mingle with the employees. In fact, he's been dating singer Cassie for about three years. And while they're coy about outright admitting their relationship, they've recently tweeted about their feelings. Diddy posted a pic of Cassie with the message, "I'm a very lucky man #knowthat," while she linked to a picture of him with the caption "love.him."