jimmy fallon 39th birthday Happy birthday Jimmy Fallon: From 'SNL' audition to 'Tonight Show' hostJimmy Fallon has come a long way from “Saturday Night Live’s” Nick Burns, Your Company’s Computer Guy to the current heir to the “Tonight Show” throne. In honor of his 39th birthday Thursday (Sept. 19), here’s a look back at some of his most fun moments.

Below we have Fallon’s “SNL” audition, a montage of his musical impersonations and a timeline of his entire career. What’s your favorite Fallon character or sketch? We’re partial to the very last video, when Fallon and Sean Hayes couldn’t keep their acts together as clothing store employees.

Happy birthday, Jimmy Fallon!