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Sienna Miller slipped into a skin-tight leather costume for a series of new photos.
The actress sports the Catwoman-style outfit for her movie GI Joe, which will be released next year.
In promotional pics, the leather-clad actress wears a pair of dark shades and has dyed her blonde hair jet black.
Sienna, 26, plays a ruthless assassin known as The Baroness in the film.
'Sienna's had a lot of fun with the movie,' a source tells The Sun. 'The Baroness is an extremely sexy but totally evil woman.'
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