Mischa Barton was paid thousands of dollars to appear and host a party in Las Vegas this weekend. Perez is reporting that she has now backed out and canceled her appearance after being arrested this week for DUI, possession of narcotics, and driving on a suspended license.

We’re told that the former O.C. star was paid a pretty penny for her appearance - in the tens of thousands.

But, now, sources reveal exclusively to PerezHilton.com that Barton has pulled out and will not be kicking it in Sin City.

Read More About Barton’s DUI Arrest

Mischa was the ‘Worst Dressed Celeb of the Day’ earlier this month.