Drinking and driving is reaching epidemic proportions in Hollywood. The latest offender? Mischa Barton, who was arrested for DUI, illegal narcotics possession and driving without a valid license in the early hours of the morning today. The former O.C. star was pulled over while driving a white Range Rover in West Hollywood , handcuffed and taken into custody and booked at 3:10 a.m., where she is being held on $10,000 bail.