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Just hours after I wondered aloud if the GI Joe movie would still happen soon with the writer’s strike on, Sienna Miller has become the first actress cast.

Miller is a British actress and will be playing fan-favorite character The Baroness. In addition to being Destro’s right hand lady, she’s a skilled spy and a master of disguise.

Filmingwith director Stephen Sommers will begin in February 2008 to make the August 7, 2009 release date. Miller will dye her hair black for the role or everyone will cry.

Read more at Variety. Thanks to Joey O for the tip.