Viggo Mortensen will be a guest on ‘The Late Show with David Letterman’ on Wednesday, September 12th. He is there to promote his latest film ‘Eastern Promises’, a new thriller again directed by David Cronenberg, who worked with Mortensen on ‘A History of Violence’. ‘The Late Show’ airs on CBS at 11:35PM Eastern. ‘Eastern Promises’ is set to be released on September 14th.