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Blake Lively
Credit: Cindy Ord/Getty Images

Blake Lively (in Dolce & Gabbana) showed her allegiance to Christian Louboutin during a bash for Les 20 Ans, a book of images marking the shoe guru's 20th anniversary in the footwear business, held at Barneys in New York City. Click through to see Mary-Kate and Ashley Olsen, Anne Hathaway and more stars at last night's hottest parties.