Pete Wentz Out with the Old In with the New Girlfriend

12/8/2011 6:53 AM PST

Pete Wentz -- Out with the Old, In with the New GF Meagan Camper

Now that his marriage to Ashlee Simpson is officially over ... Pete Wentz hit the town with his NEW model girlfriend Meagan Camper in L.A. last night.

While his marriage lasted 3 and a half years, Pete and Meagan have been dating for just about three months.