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Kim Kardashian celebrates her 31st birthday in Las Vegas

<div class="meta "><span class="caption-text ">Kim Kardashian arrives at her birthday party at Marquee Nightclub at the Cosmopolitan in CityCenter on October 22, 2011 in Las Vegas, Nevada. (WireImage&#47;Denise Truscello)</span></div>
October 23, 2011 12:00:00 AM PDT