With a fuchsia strapless dress that accentuated her voluptuous figure, Salma Hayek was already guaranteed to turn heads on the Cannes red carpet. So she used the opportunity to draw attention to a crisis -- the kidnapping of more than 200 Nigerian girls. The Oscar-nominated actress carried a sign with the hashtag "Bring Back Our Girls" as she walked in front of a throng of cameras to a preview of her animated film "The Prophet" on Saturday.