Justin Timberlake, Jimmy Fallon

Late Night with Jimmy Fallon may transform into The Barry Gibb Talk Show next week as Fallon welcomes his first guest, Justin Timberlake.

The two played Bee Gees for Saturday Night Live's fictional take on a falsetto-filled chat-fest, but will have to be themselves for at least part of Fallon's inaugural interview. The first show is Monday.

Other guests slated for Week One include Gossip Girl's Chace Crawford, Clap Your Hands Say Yeah, Robert DeNiro and Van Morrison.

Fallon is still warming-up — and perfecting the art of reading a teleprompter while looking into the camera — in a series of online-only clips, including this one that investigates the supposed resemblance between 30 Rock's Jack McBrayer and Louisiana Gov. Bobby Jindal: