WWW.ACEPIXS.COM . . . . . ....April 19 2010, New York City....American Idol contestant Katie Stevens made an appearance at the 'Late Show with David Letterman' on April 19 2010 in New York City....Please byline: NANCY RIVERA- ACE PICTURES.... *** ***..Ace Pictures, Inc: ..tel: (212) 243 8787 or (646) 769 0430..e-mail: info@acepixs.com..web: http://www.acepixs.com