The Late Show with Stephen Colbert Season 4 Ricky Gervais, X Ambassadors Season 4, episode 174 Ricky Gervais, X Ambassadors July 15, 2019 45 min Stephen welcomes actor Ricky Gervais with musical guest X Ambassadors. Previous episode Chris Christie, Carly Zakin, Danielle Weisberg Next episode Awkwafina, Donny Deutsch, The Mountain Goats