Fashion Party Pics: Gaga Performs, Mayhem Ensues

The week's biggest night of parties started off quietly enough, with Barneys celebrating photographer duo Inez and Vinoodh's new jewelry collection, fragrance, and book. Across town, Glamour's Cindi Leive hosted a dinner for the magazine's latest cover girl, Kerry Washington, with guests like Jason Wu and Tory Burch. But then came the after-parties: Christian Siriano's included Christina Hendricks and Selma Blair, while Prabal Gurung's drew Kate Young and Ciara. The night ended with two of the week's biggest shindigs so far: Alexander Wang's Harajuku-themed bash, held in an old mall at the South Street Seaport (Rihanna was there, and Nicki Minaj performed), and V magazine's late-night dance party with Lady Gaga, who joined guests like Paris Hilton and James Franco. Check out the revelers in our slideshow, and be grateful that Advil was invented.

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