WWW.ACEPIXS.COM . . . . . ....NEW YORK, JULY 7, 2005 ....Bruce Willis and Mos Def on the set of their new movie '16 Blocks.' ....Please byline: KRISTIN CALLAHAN - ACE PICTURES.. . . . . . ..Ace Pictures, Inc: ..Craig Ashby (212) 243-8787..e-mail: picturedesk@acepixs.com..web: http://www.acepixs.com