Around 1500 guests attended the ceremony, including King Simeon II of Bulgaria and his wife Queen Margarita, King Fuad II of Egypt, Prince Mohammed bin Hamad of Qatar, Duarte Pio, Duke of Braganza and his wife Isabel, Duchess of Braganza, Prince Emanuele Filiberto, Prince of Piedmont, Leka, Crown Prince of Albania and his wife Crown Princess Elia, Xavier Bettel, Prime Minister of Luxembourg and his husband Gauthier Destenay, Prince Louis de Bourbon and his wife Princess Maria Margarita de Bourbon, Prince Aimone, 6th Duke of Aosta and his wife, born Princess Olga of Greece, Russian monarchist and billionaire Konstantin Malofeev, Sarah Fabergé, French journalist and socialite Stéphane Bern, as well as many members of Russian, Spanish and European nobility.