Mischa Barton arrested for investigation of DUI and possession of marijuana

WEST HOLLYWOOD, Calif. -- Mischa Barton was arrested Thursday morning for investigation of driving under the influence of alcohol and possessing marijuana after sheriff's deputies saw her car straddling two lanes of traffic.

The 21-year-old actress, who starred on Fox's teen drama "The O.C.," was driving on La Cienega Boulevard in West Hollywood when she was stopped about 2:45 a.m., authorities said.

Deputies saw her vehicle straddling the lanes and failing to signal for a turn, according to a sheriff's news release.

"During Ms. Barton's detention, it was determined that she was an unlicensed driver and was driving while under the influence of an alcoholic beverage," the statement said.

Barton was also arrested for investigation of driving without a license and possessing a controlled substance, according to a statement from sheriff's Sgt. John Hocking.

She spent about seven hours in the West Hollywood jail before being released on $10,000 bail. A court hearing was scheduled for Feb. 28.

Calls to her manager and publicist weren't immediately returned.

Her arrest was first reported by the Hollyscoop.com Web site.

Barton played Marissa Cooper on "The O.C." from 2003 to 2006, when her character died in a car crash.

In May, the actress was hospitalized for two hours after an antibiotic she was taking interacted badly with alcohol.