Julia Roberts, Alice Cooper The secret word is ""molar,"" while Dave measures Julia Roberts' waist. Details Casts Title Julia Roberts, Alice Cooper Genres Talk Comedy Release Date 1999-05-17 Episode Runtime 01 Hours 03 Minutes Season Number 6 Episode Number 154 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)