"Is this the 23rd hour of The Today Show?,” Letterman asked as he wandered onto the stage to greet Jimmy Fallon.

David Letterman made a surprise cameo on The Tonight Show Starring Jimmy Fallon on Feb. 10, interrupting Fallon's monologue ...

Feb. 11 (UPI) -- David Letterman joined Jimmy Fallon during his monologue on The Tonight Show Monday. "Is this the 23rd hour of the Today show?" asked the former Late Show host, feigning confusion, ...

On the “Tonight Show Starring Jimmy Fallon,” the host poked fun at the Chiefs on Monday night. This came in the form of a ...

Feb. 11 (UPI) -- David Letterman joined Jimmy Fallon during his monologue on The Tonight Show Monday. "Is this the 23rd hour of the Today show?" asked the former Late Show host, feigning confusion, ...

While appearing on 'The Tonight Show' in 2014, Kerr demonstrated butt-toning exercises that she claimed could be performed ...

On Feb. 10, David Letterman stopped by “The Tonight Show Starring Jimmy Fallon” while his former bandleader, Paul Shaffer, ...

Fallon was riffing with Paul Shaffer and the World’s Most Dangerous Band, Letterman’s longtime sidekick and band from his time hosting CBS’ Late Show from 1982 to 2015 — Shaffer and co were filling in ...

It was a 30 Rock homecoming for David Letterman on February 10, as the former Late Night with David Letterman Host unexpectedly popped up during Jimmy Fallon's Tonight Show monologue. The hilarious ...

Outlander's Sam Heughan has previously given his verdict on Taylor Swift's relationship with Kansas City Chief's Travis Kelce ...

Why did Tim think he was funny? Well, a cool thing happens in 8th grade when the cool kid makes a joke — even a lame joke — ...

Around the 3:47 mark of Jimmy Fallon's monologue on Monday's The Tonight Show, David Letterman came out of retirement to crash the party. "Is this the 23rd hour of the Today Show?" he quipped, before ...