Sienna Miller straps on the leather for gun-toting GI Joe

They say imitation is the sincerest form of flattery and it appears Sienna Miller may be taking inspiration from Kate Beckinsale's vampire warrior in Underworld for her latest film role. The svelte blonde channels the spirits of Kate's character Selene and Angelina Jolie's Lara Croft as she bulks up the play villainess