The 24-year-old actress (in Juicy Couture sunglasses) was joined by Nicole Richie at the barbecue, which was thrown by Mulberry.
Earlier in the week, Camilla wore Alberta Ferretti for Good Housekeeping’s Shine On Awards in New York City.
During the show, Camilla and Kathy Ireland stepped onto the stage to honor the late Elizabeth Taylor and Geraldine Ferraro at the ceremony.
