Charlie Sheen's Ex Brooke Mueller Charged With Cocaine Possession

Brooke Mueller has been charged with felony possession of cocaine with intent to distribute stemming from her December 2 arrest in Aspen, Colorado ... TMZ has learned.

Brooke has been charged with one count of having MORE than 4 grams of cocaine ... but prosecutors have covered themselves by filing another count -- possessing LESS than 4 grams, in case there's a problem with the measurement.

The amount of coke Brooke allegedly possessed determines the penalty ... if she's convicted. For more than 4 grams, Brooke could face 6 years in prison. For less than 4 grams, she'd face 18 months in prison. But the reality is ... since she would be a first time offender, she'd almost certainly get probation.