The last time they were together they were a hit! This week on Late Night with Jimmy Fallon, Justin Timberlake returns! It’s a week that promises to be filled with skits, songs and lots of laughs! If you check out Fallon’s Late Night website, Justin Timberlake is penciled in as the musical guest all week long. There’s even word of an Acappella (did I spell that right?) song where Fallon joins in! Who needs Shark Week when you have TimberWEEK?!