Mischa Barton attends amfAR's Cinema Against AIDS Gala during the 64th Annual Cannes Film Festival at Hotel Du Cap on May 19, 2011 in Antibes, France.
( - Source: Francois Durand/Getty Images Europe)
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Mischa Barton turned up somewhat unexpectedly at the amfAR gala in a timelessly chic black sweetheart gown. While Mischa still donned her signature dramatic smoky eye, there was something more refined about her look on Wednesday.