This is blonde bombshell Sienna Miller as you've never seen her before. The actress went brunette and swapped her boho wardrobe for a leather, dominatrix-style look for her new film GI Joe: The Rise Of Cobra.
The change in image was called for by her role as The Baroness, a femme fatale whose beauty is matched only by her ruthlessness. Fans can catch the comic book flick in UK cinemas from August.
A new brown 'do isn't the only change of direction cinemagoers can expect from Sienna. The screen lovely is in the frame to play an Oxford University don who is blinded during the Second World War.
Screenwriter Shamim Sarif, said an "English rose type" was needed for Dreaming Spires, which follows the love story between the female professor and an American student
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