The former O.C. star will make her return to the small screen with a role on another CW show, A Beautiful Life, produced by Ashton Kutcher.
"Ashton developed it about his life growing up as a model from Iowa, so it's about the whole fashion world that he was in, and obviously I have a lot of friends in the fashion world, so I'm used to being around a lot of people in that," Barton tells PEOPLE on Thursday night at a GQ magazine-hosted party to celebrate new men's fragrance Burberry the Beat.
And Barton, who recently attended the fashion shows in Paris, promises to put the catty in catwalker. "[I play] a bitchy model-type character, like it's a totally different character for me," says Barton