Genevieve Jones, Crystal RennUNICEF Masquerade Ball UNICEF Masquerade Ball Chelsea Leyland, Kyle Hotchkiss Carone

Last night in NYC, Nicky Hilton, Sigourney Weaver, Jessica Stam and other fashionable guests attended American Ballet Theatre's Opening Night Gala, UNICEF held its annual Masquerade Ball, a chic Naomi Watts channeled Princess Diana at the "Diana" film premiere, and so much more!