On Friday, well-heeled celebrities, socialites, and fashionistas from around the world donned their most fabulous disguises for the annual Save Venice Ball at New York's iconic Pierre Hotel, presented by Oscar de la Renta. Sienna Miller, Alicia Silverstone, and Toni Garrn rubbed elbows with Lauren Santo Domingo, Derek Blasberg, and Sofía Sanchez de Betak at the black tie affair to support Italy's most stunning city. Unsurprisingly enough, there were even a few royals in attendance. Click through for an inside look at NYC's most glamorous masquerade ball.

[Photo via @chufy]