We all have to start somewhere. Jimmy Fallon, the newly crowned king of late night TV, has just reached a monumental milestone, taking over NBC's 'Tonight Show' last night -- but let's go back a few years, and check out Fallon as he auditioned for 'Saturday Night Live'.

And the rest, as they say, is history.

CLICK BELOW TO WATCH LADY GAGA, JOAN RIVERS, SETH ROGEN, AND MORE WELCOME JIMMY TO THE TONIGHT SHOW

Jimmy Fallon Launches 'Tonight Show' With Lady Gaga + More

- George McIntyre
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