Sienna Miller just can't stay away from the '60s. First she played Andy Warhol's muse Edie Sedwick in Factory Girl, and now she's signed on for the lead in another peace-and-love era film, Hippie Hippie Shake. The movie, which also stars Cillian Murphy, is based on Richard Neville's memoir of the same title about the Oz magazine trial — the longest obscenity trial in British history — and the ultimate end of the swinging '60s era in London.