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Katy Perry makes surprise appearance at UK screening

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