White dresses were huge on spring 2011 runways, and in Cannes the trend is everywhere, from Elizabeth Olsen's lacy frock to Cheryl Cole's boob-tastic gown. But for every white look, the red carpets are also, er, peppered with black. Naomi Campbell and Gwen Stefani stuck with black, choosing a short, tight dress and a long, sparkly jumpsuit, respectively. Meanwhile, some stars like Jane Fonda, Georgina Chapman, and Karolina Kurkova have opted to try both all-white and all-black ensembles on the carpet. See a complete roundup of the white versus black looks ahead.