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  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
  Yes No

• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
  Yes No

• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
  Yes No

• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
  Yes No

• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
  Yes No

• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Are you sure?
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• 
  Singer Katy Perry made an appearance at the 'Late Show with David Letterman' ...
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  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Katy Perry leaves the Late Show with David Letterman on August 24, 2010 in Ne...
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• 
  Singer Katy Perry made an appearance on the 'Late Sow with David Letterman' o...
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  Singer Katy Perry made an appearance on the 'Late Sow with David Letterman' o...
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