Chris Brown pleaded not guilty Monday to threatening and assaulting his girlfriend, fellow music star Rihanna. The 19-year-old R and amp;B singer entered his plea, speaking in a soft voice, while standing alongside his lawyer, Mark Geragos. His mother sat in the first row, red-eyed. Within moments of the hearing, a lawyer for Rihanna said the singer was hoping a plea deal could be reached before the case goes to trial. “She would be pleased if this was over quickly,” attorney Donald Etra said. He reiterated that Rihanna would testify if required. Brown was charged in March by Los Angeles County prosecutors with felony assault likely to cause great bodily injury and making criminal threats. He was arrested nearly a month earlier after police said he was involved in an early morning altercation with a woman who identified the “Run It!” singer as her attacker. Court records list Brown's victim as “Robyn F.” Rihanna's real name is Robyn Rihanna Fenty. Etra represented the 21-year-old “Umbrella” singer at Monday's arraignment, but did not speak during the five-minute hearing. He said afterward that that the singer is in “fine spirits” and spending time with her family in Barbados. Etra said Brown's plea was “totally expected.” If convicted, Brown could be sentenced to probation or nearly five years in prison. Neither side has publicly addressed Brown and Rihanna's relationship since the incident. But there has been discernible fallout and backlash since Brown's arrest.