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CANNES, FRANCE - MAY 23: Actress Sienna Miller attends the Premiere of 'Macbeth' during the 68th annual Cannes Film Festival on May 23, 2015 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images)

CANNES, FRANCE - MAY 23: Actress Sienna Miller attends the Premiere of 'Macbeth' during the 68th annual Cannes Film Festival on May 23, 2015 in Cannes, France.  (Photo by Pascal Le Segretain/Getty Images)