Brooke Mueller, notorious bad boy Charlie Sheen's ex-wife, voluntarily extended her rehab stay  according to RadarOnline. Mueller checked herself into rehab after being arrested for cocaine possession in Aspen, Colorado in 2011.

She was benefiting so much from the 30 day treatment she made the decision to stay longer.

"This is a dramatic turn of events for Brooke as this is the first time she has ever voluntarily decided to stay in rehab. This program she is in is working, and Brooke is getting sober for herself, and that is the first time she has ever said that. In the past, family, friends have forced her into rehab, but not this time. Brooke is taking an active role in her sobriety," a source close to the situation told RadarOnline.

Making an even healthier lifestyle change, the mother of twin toddler sons is quitting her 10 year smoking habit.

"Brooke quit smoking on her own, she doesn't want to do anything unhealthy to herself anymore. Her treatment team is so impressed with her accomplishments. Brooke has said instead of smoking cigarettes, she will take vitamins!," the inside says.

Tags: Brooke Mueller