best dressed: cannes amfar gala

riley, jessica, sofia...oh my!

all photos by getty images
There are a lot of amazing dresses at Cannes, but the best ones come out for the amfAR Gala each year. 

This year produced Jessica Chastain in a slinky black dress, Riley Keough in some serious colorblocking, and Coco Rocha in amazing stripes. Oh, and Sofia Coppola in Louis Vuitton. Click through the gallery to see all our favorites!