Stephen Colbert/David Letterman

Colbert takes Letterman’s seat September 8 (John Paul Filo/CBS)

Stephen Colbert, future host of the LATE SHOW, talks to David Letterman when Colbert visits the LATE SHOW with DAVID LETTERMAN, Tuesday, April 22 (11:35 PM-12:37 AM, ET/PT) on the CBS Television Network. Photo: John Paul Filo/CBS ÃÂ©2014CBS Broadcasting Inc. All Rights Reserved