According to the early numbers, 11.3 million people tuned in for JIMMY FALLON'S debut on "The Tonight Show" on Monday night. 

That's down from the 14.6 million who watched JAY LENO'S last night but it beat out CONAN O'BRIEN'S debut back in 2009, when he attracted 9.2 million viewers.

Here's a video of Jimmy's first stand-up gig when he was just 17...