Lady Gaga launched her newest endeavor at Barneys New York last night — a whimsical Gaga Workshop just in time for the holiday season. Filled with trinkets inspired by Lady Gaga's childhood and career, the fifth floor of Barneys has been transformed into eight mini shops, complete with a huge Lady Gaga spider, a wig boudoir, and an out-of-this-world bookstore. Celebrities and designers came out to support the singer, including Blake Lively in a stunning cobalt blue suit from Elie Saab's Spring 2012 Runway. Surprisingly, Lady Gaga opted for a more conservative ensemble for the evening, a custom tweed Chanel gown designed by Karl Lagerfeld, tres chi! On Allison: Topshop top, House of Harlow necklace, JewelMint bracelet.