Tonka Trucks

The former “O.C.” star was arrested in West Hollywood Thursday morning on charges of drunken driving and marijuana possession.

Barton, 21, was pulled over at 2:46 a.m. by police who saw her weaving between two lanes of traffic on La Cienega Blvd. after they spotted her failing to signal when turning, a spokesman for the L.A. County sheriff’s department said.

She posted $10,000 bail and was released to her mother, who picked her up in the family’s black Mercedes. An unusually disheveled Barton covered her face with a scarf to hide from photographers as she rushed to the car; once inside, she slid down in the back seat.