Chris Brown Denies Rihanna Relationship Rumors

'He and Rihanna are just friends,' Brown's rep tells ABC News of hookup rumors.

Nearly three years after Chris Brown assaulted then girlfriend Rihanna, rumors have spread that the two have been hooking up for the past year. But Brown's rep has stoutly denied there is any truth to the gossip.

"He and Rihanna are just friends," his rep tells ABC News. "He is with his girlfriend, Karrueche, and is not cheating."

Sources told Us Weekly that the former couple "meet up very casually," adding, "She comes to see him anytime she's in L.A." Other sources say that "they can't get enough of each other. I don't see it ending well."

"Rihanna loves to live dangerously," another source added. "And talking to and hooking up with Chris is all part of that."

While Brown is speaking out against the report, instead of responding to the rumors, Rihanna has been posting a series of vacation photos on her Twitter. In them, she's seen posing on the beach in her bikini, hanging with her friends on a surfboard and working out on a treadmill.

Rihanna has also been focusing on the positive, which includes another week at the top of the charts for her Calvin Harris-produced track, "We Found Love." She's also set to perform with Coldplay at the Grammy Awards on February 12. She appears on their Mylo Xyloto track, "Princess of China."

"My friends @ColdPlay and I will be sharing the stage for a performance at this years Annual Grammy Awards!" Rihanna tweeted Wednesday night, later adding, "I'm in a great mood, and I got some GREAT NEWS!!! PRINCESS OF CHINA #GRAMMYS2012."

Do you believe the hookup rumors? Sound off below!