WWW.ACEPIXS.COM . . . . . .August 24 2010, New York City....Katy Perry arrives to tape the Late Show with David Letterman on August 24, 2010 in New York City....Please byline: KRISTIN CALLAHAN - ACEPIXS.COM.. . . . . . ..Ace Pictures, Inc: ..tel: (212) 243 8787 or (646) 769 0430..e-mail: info@acepixs.com..web: http://www.acepixs.com .