Maybe you’ve heard… Mischa Barton has turned down a role on “Gossip Girl.” Good or bad move? The details: “TV Guide” first reported that Barton, who played Marissa Barton on “The OC” and has been in the news for being charged with DUI, had been approached to play the role of Georgina Sparks, an old friend of reformed party girl Serena van der Woodsen (Blake Lively). “US” then reported she will not be on the show.