Brooke Mueller has pleaded guilty to cocaine possession.

The reality TV star appeared in a court room in Aspen, Colorado, today after being arrested last December for possession of a class-A drug as well as assault for allegedly hitting another woman in a nightclub.

Although the assault charges were dropped because there wasn't enough evidence, Brooke pleaded guilty to cocaine possession, according to RadarOnline.com. Under the terms of her plea deal, Brooke - who was recently released from rehab after completing 90 days treatment for drug addiction - must continue her outpatient drug treatment, and if she completes all terms of her probation, the possession charge will be dismissed in a year.

Brooke is determined to stay clean for the sake of her sons. "She's serious about staying clean, she's now living with a sober living companion, and going to Alcoholics Anonymous and Narcotics Anonymous meetings. She is hopeful that her recovery from drugs and alcohol will be sustained and lifelong. The only thing she is taking is vitamins. The main focus in Brooke's life right now is being the best mom possible to Bob and Max and staying sober," said a source.