While Charlie Sheen has kept a relatively low profile lately, his ex-wife Brooke Mueller, 34, has been up to her old tricks. Mueller, who has already been to rehab for cocaine use, was arrested in Aspen, Colo., last night for possession of cocaine and assaulting a woman. The Aspen Police Department released a statement saying they were conducting "a routine walk through" of a bar when a woman reported that Mueller had beaten her up. They didn't arrest her until later in the night at another bar, where they found her with drugs. She was released from jail on $11,000 bond. Mueller may have picked up the rough behavior from Sheen, whom she accused of assault during an argument. The upcoming Anger Management TV series star pled guilty to that charge, and the couple divorced earlier this year.