Are Rihanna and Chris Brown keeping a secret relationship? A new report suggests that the pop star and singer/rapper, who ended their relationship after Brown assaulted Rihanna in early 2009, have been privately hooking up for nearly a year.

According to Us Weekly, multiple sources have confirmed that the pair have been casually meeting up, even though Brown is currently dating model Karrueche Tran. "They can't get enough of each other. I don't see it ending well," says one industry source quoted for the piece.

Music Star Hookups and Breakups

However, a rep for Brown tells Us, "He and Rihanna are just friends… He's not cheating." A rep for Rihanna did not comment for the story.

In Feb. 8, 2009, Brown was charged with two felonies stemming from a brutal attack on then-girlfriend Rihanna that took place in his car. Both singers were scheduled to perform at the 2009 Grammys later that evening, and both performances were canceled. Brown was sentenced to five years' probation and six months' community labor in Aug. 2009.

A court order that forbid Brown from coming within 50 yards of Rihanna was lifted last February, and in May, the pair began following each other on Twitter. "Its f---in twitter, not the alter [sic]! calm down," Rihanna told upset fans at the time.

Earlier this month, Brown's manager told Billboard that the singer would not be doing interviews in the near future, instead opting "to concentrate on performing and recording" after scoring his first No. 1 album, "F.A.M.E.," last year. Meanwhile, Rihanna's single "We Found Love" returned to the top of the Hot 100 last week.