"The OC" and that's about it star Mischa Barton was arrested early this morning for DUI, possession of illegal narcotics and driving without a valid license, according to a report that first appeared on Hollyscoop.com.  TMZ adds:

(Barton) was pulled over early this morning around 2:45 AM as she was driving in West Hollywood, Calif., and is still in custody, being held on $10,000 bail.

People.com goes on to say that Barton is still scheduled to host the opening of a new Las Vegas restaurant called CatHouse over the weekend.  Hopefully they didn't pay her upfront, because Mischa will be drunk by 9 and carrying on and scooching her ass across the carpet because she thinks she's on fire by 10 at the latest.  Bravo, CatHouse, money well spent.