Chris Brown, Rihanna, and Karrueche Tran

Chris Brown just can't catch a break today. First the police report made after his 2009 assault on Rihanna was made public, and now an anonymous source is telling gossip site Tale Tela that the 22-year-old singer made his girlfriend Karrueche Tran wait in his car while he went to Rihanna's Valentine's Day birthday party.

Why? In case he didn't get lucky with Rihanna. (Brown also demanded that guests sign a confidentiality agreement at the party.)

Karrueche Tran, who describes herself as where Vietnam and the hood meet, has clashed before with Chris Brown ex-girlfriend Rihanna, including an incident at a club where Rihanna walked over, and Kae stepped to her.

Tran also made a YouTube video late last year with a few friends, in which they mocked Rihanna's accent:

Valentines day