Actress Sienna Miller attends the "Live By Night" New York Screening at Metrograph on December 13, 2016 in New York City.
(December 12, 2016 - Source: Theo Wargo/Getty Images North America) see more angles »
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Sienna Miller Loose Ponytail

Sienna Miller styled her hair into a sexy loose ponytail for the New York screening of 'Live by Night.'
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