Stephanie Pratt Stephanie Pratt

The Hills star Stephanie Pratt has been formally charged with suspicion of drunken driving, according to the Los Angeles County Superior Court.

Pratt, 23, was arrested Oct. 18 for suspicion of a DUI in Hollywood. She was released the next morning on $5,000 bail.

Pratt faces a maximum six months behind bars and a $1,000 fine.