Rachel Bilson and other celebs feted designer Roberto Cavalli on the 40th anniversary of his company at Paris' Ecole Nationale Superieure des Beaux-Arts on Wednesday. The "O.C." actress opted for one of the fashion legend's iconic leopard-print gowns for the evening. Dominique Charriau/WireImage.com - September 29, 2010
Pretty in Paris
Stars fete designer Roberto Cavalli at his 40th anniversary party in France.