Justin Timberlake and Jimmy Fallon on 'Saturday Night Live': Watch 4 classic sketches

jimmy-fallon-justin-timberlake-snl-nbc.jpg Jimmy Fallon is returning to "Saturday Night Live" with his best buddy Justin Timberlake as musical guest on Saturday (Dec. 21) for the show's last episode of 2013.  With the pair's long history of collaborating, on and off "SNL," there's plenty of material for them to make reference to.

As we wait in anticipation to see what the two bring back to Studio 8H, let's take a look at some of Fallon and Timberlake's more classic bits. Because, let's face it, though he's just the musical guest, Timberlake is totally joining Fallon in at least three sketches. Guaranteed.

1. The time they played Jessica Simpson and Nick Lachey in 2003


2. One of their many, many Barry Gibbs Talk Show sketches


3. Timberlake's Homelessville


4. Fallon's Boston teens - Bets on a cameo from Rachel Dratch?

Photo/Video credit: NBC