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Bye bye boho, hello sleek and sexy sophisticate. As the publicity push for celebrity fashion icon Sienna Miller's latest film, G.I. Joe: The Rise Of Cobra, goes into overdrive the British actress has been rocking a series of designer labels, from ‘80s inspired Gucci and chic Stella McCartney to fashion-forward Poltock & Walsh and classic Spanish brand Loewe. At premieres, photocalls and press conferences around the world the former fiancé of Jude Law and Twenty8Twelve designer's wardrobe has been working overtime, even sporting five outfits in one day in a whirlwind of promotional interviews and television appearances. Read on to take a look through her most fashionable outfits of the past fortnight...

Picture: Fitting for a film premiere in Los Angeles, Sienna goes for an old-school Hollywood look, all Veronica Lake waves, scarlet lips and glitzy gold gown for the latest screening of G.I. Joe: The Rise Of Cobra.

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