Brooke Mueller Charged with Felony Cocaine Possession

Brooke Mueller

might be on her way to "total and complete sobriety," according to her rep, but the troubled ex-wife of Charlie Sheen now faces a new obstacle in her personal life.

Stemming from her December 2 arrest in Aspen, she's been charged with felony possession of cocaine. Yikes.

Broke Mueller

has also been charged with assaulting a woman that night, but the most severe counts center on the allegation that she possessed over four grams of cocaine at the time. She could face six years in prison if convicted on that charge.

But prosecutors have also charged

Brooke Mueller

with possessing under four grams, a count that could result in 18 months behind bars.