And luxe it was. The ball, which is sponsored by fashion heavyweights Moda Operandi, BVLGARI, and Oscar de la Renta, combined social kingpins (Nicky Hilton Rothschild, Derek Blasberg, Lauren Santo Domingo, Tabitha Simmons, Joseph Altuzarra, Tory Burch, Julia Restoin Roitfield) with models (Karen Elson, Karolina Kurkova) and royalty (HRH, Crown Princess Marie-Chantal of Greece, HRH Princess Maria Olympia of Greece, HRH Princess Mafalda Saxe-Coburg).