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.