LOS ANGELES, California (X17online) - Chris Brown has pleaded not guilty to charges that he beat up and threatened Rihanna in an altercation in Chris' rented Lamborghini on the night before the Grammy Awards.

Dressed in a black sweater, Brown entered the plea in a Los Angeles Courtroom Monday afternoon. After accepting the plea, Judge Patricia M. Schnegg scheduled a preliminary hearing for April 29th.

Multiple sources have reported that Brown and his attorneys have been feverishly working to come up with a plea deal that would keep the 19-year-old out of jail, so far, no deal has been reached.

Rihanna, whose attorney's have claimed will cooperate with the prosecution, is in Barbados. She has reportedly said she would like the matter resolved quickly. The couple was spotted vacationing together in Miami following the incident and have reportedly recorded a new duet.