Actress Salma Hayek, center, holds up a sign reading "bring back our girls", part of a campaign calling for the release of nearly 300 abducted Nigerian schoolgirls being held by Nigerian Islamic extremist group Boko Haram, as she arrives for the screening of Saint-Laurent at the 67th international film festival, Cannes, southern France, Saturday, May 17, 2014. At left is director Paul Brizzi, second left, director Roger Allers, second right director Joan C. Gratz and director Gaetan Brizzi. (AP Photo/Thibault Camus)