The Metropolitan Museum's Costume Institute Gala

Vogue's Anna Wintour, in Chanel Haute Couture, with Bee Shaffer, in Balenciaga Edition with Fred Leighton jewels

Alexander Wang with M.I.A., in Alexander Wang for Gap and Repossi jewels, and Zoë Kravitz, in Alexander Wang for Gap with Van Cleef & Arpels jewels and a Hunting Season clutch.

Jessica Alba, in Sophie Theallet for Gap, with House of Lavande jewels and a Ferragamo clutch.

Francisco Costa with Zoe Saldana, in Calvin Klein Collection, and Diane Kruger, in Calvin Klein Collection with Fred Leighton jewels.

Nicole Richie, in Marc Jacobs with Harry Winston jewels and a Marc Jacobs clutch.

Oscar de la Renta with Oprah Winfrey, in a dress by the designer, with Lorraine Schwartz jewels and a VBH clutch.

"The Metropolitan Museum's Costume Institute benefit was all about stateside roots this year, celebrating as it did the opening of American Woman: Fashioning a National Identity. Proceedings inside had a turn-of-the-century feel, with wicker chairs at the dinner tables and a hot-air balloon inspired by one from the 1893 Chicago World's Fair looming over the Great Hall."