Is Mischa Barton suffering a case of Lindsay Lohan? After getting arrested for DUI, the ex-O.C. star suddenly finds herself in a precarious situation: she's due to host a party in Vegas this New Year's Eve.

Will she be forced to call things off? A rep emails us: "We are aware of Mischa Barton's incident last night, but at present she is still expected to host the CatHouse Grand Opening at Luxor Las Vegas on December 29th. We will let you know if anything changes." Decisions, decisions.

[Photo: WireImage]