Target threw a little bash last night a the IAC building to celebrate their new Shops at Target project and, WHOA, HOLY CRAP!, Wilson Phillips gave a surprise performance at the end of the night. Everyone pretty much went nuts when the trio took the stage following DJ sets by Chelsea Leyland and Theophilus London and a performance by indie-pop duo Chairlift. (And, yes, WP sang "Hold On." And, yes, it was amazing.) Other guests we spotted at the launch included Martha Stewart, Emma Roberts, January Jones (who, unfortunately, was not toting around a box of Bugles), Todd Oldham, Leelee Sobieski and Gossip Girl's Amanda Setton. The Shops at Target, by the by, will feature in-store pop-up shops in select Targets from independent boutiques around the country. These shops include Miami clothing store the Webster, Colorado cosmetics shop Cos Bar and Connecticut home goods store Privet House among others. They'll be in select stores and online this Sunday. More info here. Check out photos by Billy Farrell Agency of the evening in the gallery above.