Justin Timberlake stopped by Late Night with Jimmy Fallon and hilariouness ensued.

Watch JT and JF cover the history of rap music in under three minutes.

Arguably the best skit/song of the night. The cast of Glee, Jimmy Fallon, Randy Jackson, Tina Fey, Kate Gosselin, Betty White and Jon Hamm in a brilliant performance of Bruce Springsteen’s Born to Run.

Keep your eyes open for a few other special guests as well. A must watch for a post-Emmy Monday morning.

I can’t decide if I’m going  to give Jimmy Fallon a chance and watch the Emmy’s tonight or not. Normally the only awards I watch are the Grammy’s and the VMA’s which seem hipper and more fun. But just maybe Jimmy and company can hip up this year’s Emmys.

According to my source inside the Nokia Theatre today, the big opening number features host Jimmy Fallon coming out alone with an electric guitar and singing/playing “Born to Run.” Then he is joined by Randy Jackson from American Idol on bass. Then by a dance troupe consisting of Mad Men‘s Jon Hamm, 30 Rock‘s Tina Fey, Community/Talk Soup‘s Joel McHale, and Glee‘s Chris Colfer and Jane Lynch. (There’s also a very buxom blonde whom my source couldn’t ID.) Robin Antin, creator of the Pussycat Dolls, was choreographing. ”I left at 5 PM. I think it’s going to take a lot more time to whip the number into shape,” my insider predicted.

Hey don’t, don’t blame me. It’s a slow gossip week when the biggest thing going is worrying if Miley Cyrus will reactive her Twitter account or not.

So it’s either laugh at Jimmy Fallon making fun of the Cyri or talk about Jessica Simpson getting a new dog. I’m going with Jimmy.