TV host David Letterman; Fifth Harmony perform; Paul Shaffer sits in with Cleto and the Cletones. ...

Actress Julie Bowen (Modern Family (2009)); actor Kumail Nanjiani (The Lego Ninjago Movie (2017) and Silicon Valley (2014)); Fall Out Boy perform. ...

TV host Stephen Colbert (The Late Show with Stephen Colbert (2015)); actress Nina Dobrev (The Vampire Diaries (2009), Flatliners (2017) and Crash Pad (2017)); Dustin Lync ...

Former White House Press Secretary Sean Spicer; tennis player Sloane Stephens; 21 Savage performs. ...

Actor Michael Keaton (American Assassin (2017)); author Van Jones; The Lone Bellow perform. ...

Actor Larry David (Curb Your Enthusiasm (2000)); wildlife expert Dave Salmoni; 21 Savage performs. ...

Actress Charlize Theron (The Fate of the Furious (2017)); Tony Goldwyn (Scandal (2012) and The Belko Experiment (2016)); Romeo Santos performs. ...

Robert Downey Jr., Don Cheadle, Paul Bettany, and Emily VanCamp (Captain America: Civil War (2016)). Also: Mayer Hawthorne performs. ...

Kelly Ripa (Live with Kelly and Ryan (1988)); Billy Brown (How to Get Away with Murder (2014)). Also: Tinashe performs with Snakehips and Chance the Rapper. ...

Chef Gordon Ramsay; Jurnee Smollett-Bell (Underground (2016)). Also: Wolfmother perform. ...

Ellen Pompeo (Grey's Anatomy (2005)); Norman Reedus (Triple 9 (2016)). Also: Yo Gotti performs with Travis Barker. ...

Aaron Paul (Triple 9 (2016)); Rachel Bloom (Crazy Ex-Girlfriend (2015)). Also: KC and The Sunshine Band and CeeLo Green perform as KCee-Lo and the Sunshine Band on Mash-U ...

Singer Miley Cyrus; comedian Alexandra Wentworth, author of Happily Ali After: And Other Fairly True Tales. Also: Andy Grammer performs. ...

Seth MacFarlane (Blunt Talk (2015)); producer Brian Grazer, co-author of A Curious Mind: The Secret to a Bigger Life. Also: Halsey performs. ...

Owen Wilson (No Escape (2015)); Kaitlyn Bristowe (The Bachelorette (2003)). Also: Juanes performs. ...

Mila Kunis (Jupiter Ascending (2015)); Bob Odenkirk (Better Call Saul (2015)). Also: Charli XCX performs. ...

Kaley Cuoco (The Wedding Ringer (2015)); Omar Epps (Resurrection (2010)). Also: Steel Panther perform. ...