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Katy Perry makes surprise appearance at UK screening

<div class="meta "><span class="caption-text ">Pop superstar Katy Perry makes a surprise appearance at a special sneak preview of her new 3D feature film &#39;Katy Perry: Part Of Me&#39; at the Apollo West End on June 7, 2012 in London, England.  (J Hogan&#47;Getty Images For Paramount Pictures International)</span></div>
June 7, 2012 6:53:35 PM PDT