Jimmy Fallon ‘Freaking Out’ over ‘Tonight Show’ Debut

Late-night talk show host Jimmy Fallon is more than just excited about taking over “The Tonight Show." His big debut as host is tonight!

"I'm freaking out right now," Fallon said, calling into the radio show “On Air with Ryan Seacrest.” Jimmy added, "It's so exciting. It's crazy... this is the dream job."

Fallon also posted a message on Instagram: “This is it. We are starting a new chapter of the Tonight Show. I can't even begin to describe what we are all feeling right now here at 30 Rockefeller Plaza, NYC. But - I know that we'll never have this exact feeling ever again. By this time tomorrow we'll no longer wonder what it would be like to do the Tonight Show. We can't put that feeling - that moment back in the bottle. All we can do is try to make the best show that we can and make people happy. And we will. Here's to the first of many. Fun.”

The guests scheduled to help Jimmy kick off his debut week include Will Smith, U2, Lady Gaga, Bradley Cooper, Michelle Obama, Will Ferrell, and of course, Fallon's rap pal Justin Timberlake.