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CANNES, FRANCE - MAY 17: Princess Stephanie of Luxembourg and Prince Guillaume of Luxembourg attend the "Ismael's Ghosts (Les Fantomes d'Ismael)" screening and Opening Gala during the 70th annual Cannes Film Festival at Palais des Festivals on May 17, 2017 in Cannes, France. (Photo by Pascal Le Segretain/Getty Images)

CANNES, FRANCE - MAY 17:  Princess Stephanie of Luxembourg and Prince Guillaume of Luxembourg attend the "Ismael's Ghosts (Les Fantomes d'Ismael)" screening and Opening Gala during the 70th annual Cannes Film Festival at Palais des Festivals on May 17, 2017 in Cannes, France.  (Photo by Pascal Le Segretain/Getty Images)