WWW.ACEPIXS.COM . . . . . ....April 13 2009, New York City....Actor Zac Efron made an appearance at the 'Late Show with David Letterman' on April 13 2009 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