In this photo released by CBS, actor Joaquin Phoenix, left, waives to the audience from the set of the "The Late Show with David Letterman," in New York, Wednesday, Feb. 11, 2009 as host David Letterman watches from the desk. AP Photo logo AP Photo 9 months ago

In this photo released by CBS, actor Joaquin Phoenix, left, waives to the audience from the set of the "The Late Show with David Letterman," in New York, Wednesday, Feb. 11, 2009 as host David Letterman watches from the desk.