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

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

John Oliver wasn't the only late night icon to crash this week. "The Tonight Show" started Monday off with a surprise ...

After singing the updated version of "Asshole," Leary and Fallon sat down to discuss the song. "I don't know if people are ...

Live' veterans participated in a "Tonight Show Joke Off," a riff on SNL's "Weekend Update" segment during which they battled it out for the best punchlines.

Philadelphia Eagles star Saquon Barkley nearly made Tonight Show host Jimmy Fallon fall over laughing when describing his ...

The appearance from the former Late Night and Late Show host offered a reunion with bandleader Paul Shaffer, who is sitting in with his World’s Most Dangerous Band on The Tonight Show this week. The ...

Boston Celtics point guard Jaylen Brown appeared on "The Tonight Show with Jimmy Fallon" on Tuesday to talk about his ...

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, ...

TV legend David Letterman returned to his former stomping grounds at 30 Rockefeller Plaza Monday for a surprise appearance on ...

The 'Eternal Sunshine' singer has appeared as a musical and conversation guest on the well-known late-night chat show over ...

The clip labeled Fallon an 'absolute menace,' as the then 24-year-old animatedly interacted with late-night host Conan ...