Originally Posted by TMZ

TMZ has confirmed that Mischa Barton has been arrested on suspicion of DUI, possession of narcotics and driving on a suspended license.

According to a press release issued by the L.A. County Sheriff's Department, the former "O.C." star was pulled over early this morning around 2:45 AM as she was driving in West Hollywood, Calif. Cops say she "was seen straddling two lanes of traffic and failed to signal when making a turn." When deputies pulled her over, they determined that she "was an unlicensed driver and was driving while under the influence of an alcoholic beverage."

She was released from the West Hollywood Sheriff's station at 10:10 AM today -- and was caught by TMZ sneaking out of the joint in the back seat of her parents' Mercedes.