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Bradley Cooper, Jayne Atkinson and Judith Light are among the actors who have signed on to appear in the 2009 mainstage season at the Williamstown Theater Festival.

Cooper ("The Hangover") replaces the previously announced Rob Corddry in a July staging of Sam Shepard's "True West," also starring Nate Corddry and Debra Jo Rupp ("That '70s Show").

Atkinson ("Blithe Spirit") will appear in Simon Gray's play "Quartermaine's Terms" in August, while Light ("Ugly Betty") stars in a July production of A.R. Gurney's "Children" with Katie Finneran and James Waterston, among others.

Dana Ivey and Jessica Hecht, meanwhile, join the cast of "The Torch-Bearers," adapted and directed by Dylan Baker.

Massachusetts' Williamstown Theater Fest, which annually attracts a sizable contingent of Broadway talent thanks in part to its proximity to Gotham, runs July 1-Aug. 23. Casting for the fest's second-stage lineup remains to be announced.