Chris Brown Assaults Rihanna

Usmagazine.com reports that singer Chris Brown allegedly assaulted girlfriend Rihanna. Brown, 19, reportedly turned himself in to the L.A. police around 6:30 p.m. Sunday. He was officially booked at 7:41 for making criminal threats.

Brown posted $50,000 bail and was released.

Brown is due in court March 5. The case is being presented to the L.A. County District Attorney's office and additional charges may be filed.

An unidentified woman called 911, claiming she had gotten into a fight with Brown and he attacked her. According to police, the woman had visible injuries. Brown had left the scene by the time police arrived.

Both Brown and Rihanna pulled out from Sunday's Grammy Awards at the last minute. Both were due to perform.

Rihanna's rep says that the singer is doing well.