The Tonight Show Starring Jimmy Fallon Season 4 Charlize Theron, Michael Phelps, Julie Klam, SZA Season 4, episode 173 Charlize Theron, Michael Phelps, Julie Klam, SZA July 20, 2017 45 min Previous episode Harry Styles, Jenny Slate, the Who Next episode Kevin Bacon, Jenna Dewan Tatum, Nate Bargatze