CANNES, FRANCE - MAY 16:  Sienna Miller attends  "The Sea Of Trees" Premiere during the 68th annual Cannes Film Festival on May 16, 2015 in Cannes, France.  (Photo by Mike Marsland/WireImage)

CANNES, FRANCE – MAY 16: Sienna Miller attends “The Sea Of Trees” Premiere during the 68th annual Cannes Film Festival on May 16, 2015 in Cannes, France. (Photo by Mike Marsland/WireImage)