New York City socialites love a black tie ball for a cause. Throw a theme in there and everyone is set. It's no wonder, then, that the Save Venice masquerade soirée remains one of the most well-attended and glamorous affairs of the year. On Friday, the likes of Poppy Delevingne, Lauren Santo Domingo, and Princess Olympia of Greece dressed their ballo in maschera best and partied the night away with Oscar de la Renta at the Pierre Hotel. This year's theme was "Dangerous Beauty," and from the glittering masks to the decadent decor by Bronson van Wyck, guests were certainly arrested by the stunning glamour of it all. The best part? It all supported Save Venice, which restores artwork and keeps the Italian city alive. Click through for an inside look at the night!

[Photo via @chloebartoli]