Kim Kardashian was among the many celebrities who stopped by Jimmy Fallon's Tonight Show debut. She owed him some money.

Pay up, Mariah Carey! The singer owes Jimmy Fallon a few bucks.

Lindsay Lohan stopped by The Tonight Show with Jimmy Fallon. She was one of many big names to show up for his premiere.

Seth Rogen made a fun cameo on Jimmy Fallon's first episode as host of The Tonight Show.

Stephen Colbert snaps a selfie with Jimmy Fallon on the latter's debut as Tonight Show host.

Tina Fey lost a bet to Jimmy Fallon. He did end up as Tonight Show host after all.

Sarah Jessica Parker paid Jimmy Fallon $100 because she lost a bet with the new Tonight Show host.

Tracy Morgan settles a bet here with Jimmy Fallon. He was wrong about the comedian never hosting The Tonight Show.

Joan Rivers stops by the first Tonight Show under the guidance of Jimmy Fallon in this photo.

Here, Jimmy Fallon! Mike Tyson settles a bet during this Tonight Show cameo.

Jimmy Fallon attends the 2022 Met Gala in New York City.