WWW.ACEPIXS.COM . . . . . ....August 24 2010, New York City....Singer Katy Perry made an appearance at the 'Late Show with David Letterman' on August 24 2010 in New York City....Please byline: NANCY RIVERA- ACEPIXS.COM.... *** ***..Ace Pictures, Inc: ..Tel: 646 769 0430..e-mail: info@acepixs.com..web: http://www.acepixs.com