Reports say that Chris Brown and Rihanna have been secretly hooking up for a year. According to Us Weekly, multiple sources have confirmed that the two have been meeting up "very casually." The source continued, "She comes to see him anytime she's in L.A." A music industry source said, "They can't get enough of each other. I don't see it ending well. Rihanna loves to live dangerously, and talking to and hooking up with Chris is all part of that." Chris Brown's rep quickly turned down the story. The rep said, "He and Rihanna are just friends. He's not cheating." The magazine also reported that Chris' girlfriend Karrueche, 23, knows all about Chris and RiRi's alleged relationship. An insider said about Karrueche, "She definitely chased Chris, and it worked! He was really into her in the beginning and still is. He tells her she's beautiful all the time." Another source said,, "Karrueche thinks Chris' studio is where most of the hookups have taken place." But she is allegedly determined to hang onto Chris. A source said, "won't give him up for a few discretions." Another insider said, "Chris is a really passionate guy...He's still a hothead and he does what he wants . . . He'll go off the grid she'll wonder what's going on, but at the moment Chris and Karrueche are still a couple."