Mischa Barton may have been feeling nostalgic for her days on "The O.C." Like her character Marissa Cooper, the actress was caught being irresponsible with alcohol.

The 21-year-old was arrested in West Hollywood early Thursday morning for DUI, reports People.

Lieutenant Honings of the West Hollywood Sheriff's office said that the former "O.C." star was stopped at 2:46 a.m. when she was seen weaving between lanes and then making a turn without signaling. She was booked for driving under the influence of alcohol, possession of illegal narcotics and driving without a valid license.

By 10 a.m., she was released after posting $10,000 bail.

Barton is best known for playing Marissa Cooper on FOX's "The O.C." Last season, her character died in a car crash. Her film credits include "Notting Hill," "The Sixth Sense" and the upcoming Black Plague comedy "Virgin Territory," "St. Trinian's" and "Closing the Ring."