** FILE ** In a Dec. 12, 2008 file photo singers Rihanna and Chris Brown perform at Madison Square Garden in New York. Rihanna and Brown were last minute absences at the Grammy Awards Sunday Feb. 8, 2009. (AP Photo/Evan Agostini/file)
Chris Brown has pleaded not guilty to threatening and assaulting his girlfriend, fellow music superstar Rihanna.
The 19-year-old R&B singer appeared in a Los Angeles courtroom Thursday alongside his attorney.
He entered his plea in a soft voice while his mother sat in the first row, red-eyed.
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.
The 21-year-old "Umbrella" singer was represented by attorney Donald Etra
If convicted, Brown could be sentenced to probation or nearly five years in prison.
(Copyright 2009 by The Associated Press. All Rights Reserved.)