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W Magazine threw a party at Saks Fifth Avenue last night to celebrate the September Issue of the magazine. Zac Posen and Serena Williams were there, and Andrew and Andrew provided the music from their I-Pad while walking around the room.-

The party was intimate and casual, with a full bar of Belvedere Vodka and apps being passed around (props on the crabcakes, caterers.)

The most unique element of the party was The Bumbys, disguised performance artists who were giving out personalized critiques of the guests' clothing.