Just hours before he was to perform at the Grammy Awards, R&B singer Chris Brown, 19, was arrested for allegedly assaulting his girlfriend, singer Rihanna, 20. The couple began fighting in Brown’s Lamborghini after leaving a pre-Grammy party in Los Angeles, said Foxnews.com. Rihanna called 911, and police found her “beaten really badly and hysterical,” a source told E! Online. Brown was released on $50,000 bail.