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"After touring Cannes, France last week and unexpectedly parting with some &amp;quot;sentimental&amp;quot; items in her luggage, Kim Kardashian was looking to let loose.\r\nBefore making an appearance at The Pool After Dark at Harrah&amp;apos;s resort in Atlantic City, NJ on Sunday, the Keeping Up with the Kardashians star made a beeline for Beyonce&amp;apos;s concert with pal Brittny Gastineau and her makeup artist Mario at Revel&amp;apos;s Ovation Hall. Kardashian and Gastineau enjoyed a night of dancing and singing along with the songstress&amp;apos; chart-topping hits.\r\n\r\nBackstage, Kardashian, 31, got a chance to chat with the woman of the evening herself, and the pair were seen greeting each other with an embrace and dancing together. Beyonce&amp;apos;s husband of four years, Jay-Z, is best friends with Kanye West, Kardashian&amp;apos;s serious boyfriend.\r\n&amp;quot;Kim thought it was such a great show,&amp;quot; a source tells Us Weekly. &amp;quot;There&amp;apos;s always some random rumors there is tension between them and there totally isn&amp;apos;t! Kim had so much fun.&amp;quot;\r\n\r\nThe E! star is one of several A-listers who made it out to Beyonce&amp;apos;s four-concert weekend, which marked her post-baby performance debut since giving birth to daughter Blue Ivy in January.\r\nOn Saturday, First Lady Michelle Obama, 48, and her daughters Malia, 13, and Sasha, 10, watched the show from a private box where they did the &amp;quot;Single Ladies&amp;quot; dance together and rocked out to &amp;quot;Crazy in Love.&amp;quot; Oprah&amp;apos;s BFF Gayle King sat nearby.\r\n\r\nDuring Saturday&amp;apos;s encore, Beyonce, 30, revealed to the sold-out venue that she had lost a whopping 60 pounds since giving birth.\r\n&amp;quot;Y&amp;apos;all have no idea how hard I worked! They had me on that treadmill. I ate lettuce!&amp;quot; she told her fans. &amp;quot;Now tonight I&amp;apos;m gonna get chocolate wasted!&amp;quot;"^^<http://www.w3.org/2001/XMLSchema#string>
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