Bruce Willis, Will Ferrell Carole King sits in with Paul, then sings a duet with Bruce Willis. Details Casts Title Bruce Willis, Will Ferrell Genres Talk Comedy Release Date 1999-10-11 Episode Runtime 01 Hours 03 Minutes Season Number 7 Episode Number 25 Production Companies Worldwide Pants, CBS Entertainment Productions, CBS Productions, CBS Studios David Letterman Self - Host Paul Shaffer Self -Musical Director Alan Kalter Self - Announcer (voice)