Rachel Bilson's Barton misery

Rachel Bilson is miserable that Mischa Barton quit 'The O.C.' - because she has nobody to go shopping with.Rachel - who played Mischa's character Marissa's best friend Summer Roberts in the hit series - has revealed the pair used to regularly hit the shops together.Since Mischa left Rachel has been forced to curb her extravagant sprees.She revealed to Cosmopolitan magazine: "Mischa and I love the shops! We really love shopping! We used to do a lot of shopping together, but I don't see her so often now. One time we even picked out the same top from opposite sides of the store!"Rachel is currently starring in new movie 'The Last Kiss', opposite 'Scubs' star Zach Braff.The actress is also reportedly being lined up to play 'Wonder Woman' in the new comic book movie.