Though we’ve seen lots of stars go dark for roles in the past few months — Jessica Biel and Mischa Barton pop to mind — we had to look twice when Sienna Miller appeared with long brunette hair on the set of her new film Hippie Hippie Shake. She was almost unrecognizable with her wig on! We definitely prefer the British star with her normal blonde bob that highlights her big blue eyes and unique fashion sense, but we want to know what you think. Tell us: Do you like Sienna with brunette hair? Or should she stick to blonde off camera?