The Tonight Show Starring Jimmy Fallon

The English pop icon made her U.S. television debut on The Tonight Show With Jimmy Fallon.

And: Would Cera ever do an Allan Barbie spinoff movie?

Fallon's hilarious song honors the Chiefs tight end's joyful mid-00s tweets about feeding squirrels and chillin' with his "boi" Reggie. 

It was a surprise party for the Law & Order: SVU star's 60th birthday. 

The host of the hit Peacock series told Jimmy Fallon—who's a Traitors fan—that he keeps all his amazing outfits from the show, for one.

The Grammy-winning American Idol judge recreated the iconically-weird video for his hit "Hello" with Jimmy Fallon—with Richie playing the part of the clay bust. 

The Migration actor also busted out his characters from The Super Mario Bros. Movie and Key & Peele in a visit to The Tonight Show Starring Jimmy Fallon.

Wilson, who played Dwight Schrute, told Jimmy Fallon that after five hours, he turned to his seat mate and asked him what he thought of the sitcom.

Before Elmo fell out with Rocco (and broke the Internet by asking everyone how they're doing), he had a brief and hilarious spat with Jimmy Fallon—watch the clip now. 

Howard and Jimmy Fallon untangled the online rumor about Argylle's script, explaining that it all actually connects—to Taylor Swift's cats, who inspired the director.