Mischa Barton has joined an all-star cast for a film about the famous St Trinian's boarding school, according to sources in from Hollywood. The actress will co-star with Rupert Everett, Colin Firth, Lena Headey, Caterina Murino, Stephen Fry, Jodie Whittaker, Celia Imrie, Anna Chancellor, Russell Brand and Toby Jones in the film, to be directed by Oliver Parker and Barnaby Thompson. St. Trinians will be based on a series of famous cartoons depicting the lives of naughty schoolgirls at a posh private boarding school. | 
