Mischa Barton is still set to host a New Year’s bash in Las Vegas this weekend. “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,” a rep for the lounge said in a statement. “ We will let you know if anything changes." The O.C. alum, 21, was arrested at 3 a.m. yesterday morning after police spotted her weaving between two lanes of traffic in West Hollywood. She was charged with possession of a controlled substance and possession of marijuana, according to a Los Angeles Sheriff’s Deputy Sgt.source
