Jimmy Fallon's already announced that he's landed U2 as the first musical guest on his revamped Tonight Show, which debuts on NBC February 17.  Now he's announced some of the other musical guests you'll be seeing during his first week.

Chief among them is, big surprise, Fallon's buddy Justin Timberlake, who's appeared on Fallon's Late Night a dozen times, resulting in some of that show's most memorable bits.  He'll be on The Tonight Show Friday, February 21.  Lady Gaga will appear on the show on Tuesday, February 18, and the rest of the week includes appearances by country star Tim McGraw and alt-rockers Arcade Fire.

Fallon's non-musical first-week guests include Will Smith, Jerry Seinfeld, Bradley Cooper and Will Ferrell.