More than 1,200 people descended on Skylight Studios on Wednesday night for the Whitney's annual Art Party. Sponsored by BCBG Max Azria, the designer (left, with co-host Camilla Belle) and wife Lubov welcomed the likes of Lake Bell, Lydia Hearst, Gretchen Mol, Hilary Rhoda, Calvin Klein, Jason Wu, Tinsley Mortimer, Genevieve Jones, Fabiola Beracasa, Ali Larter, Lindsay Price, Stacey Bendet, Olivia Palermo, Meredith Melling Burke, Alexis Bryan Morgan, Ivanka Trump, Byrdie Bell, Bradley Cooper, Alexis Bledel, Selita Ebanks, Hana Soukupova, Claire Bernard, Amber Tamblyn, Adam Lippes, Alexandra Richards, Anne Slowey, Lydia Fenet, Roopal Patel, Gilles Mendel, Lela Rose, Brooklyn Decker, Zani Gugelmann, Allison Aston, Esteban Cortazar, Jessica Joffee, at least two members of the Willis clan (Tallulah and Scout), and the man who runs the show at Whitney, Adam Weinberg. [PMc, Wireimage, FWD, WWD, VF, Style.com, ArtInfo]

The Museum of Natural History held its annual dance last night.

A recap of the last few days in benefits and parties—including the Frick Collection's Young Fellows Ball, above—is after the jump.

1) Piaget launched its new Limelight Paris-New York Collection last night with a party at The Loft & Garden at Rockefeller Center, where Leighton Meester and Emmy Rossum (left) mingled with Liv Tyler, Maggie Gyllenhaal, Becki Newton, Mena Suvari, Joe Zee, Lisa Anastos, Lydia Fenet, Allison Aston, Adam Lippes, Roopal Patel, Zoe Kravitz, Philippe Leopold-Metzger, Geoffrey Bradfield, Gillian Miniter, Kate Schelter, Meredith Melling Burke, and Paul Sevigny. [FWD, PMc]