Sienna Miller swapped her hippie chic for a grown-up and glamorous Burberry LBD on Thursday night.
The actress attended the special screening of her new film, Just Like A Woman, at the Crosby Street Hotel in New York looking fabulous in the sleek pencil dress, which she paired with Iro courts.
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A relaxed ponytail softened the look, which we think is understated elegance at its best.
Flick through our Sienna style gallery for more of her fashion moments: