We already know that Justin Timberlake has a good sense of humor -- he's like the SNL celebrity skit king. So it would only make sense that J.T. would bless new Late Night host Jimmy Fallon with some of his killer impressions.
So, which celebrity was the lucky winner chosen to be mocked by Mr. Sexyback himself?
The very self-deprecating John Mayer, who we're sure loved Justin's take on his song "Daughters".
Check it out.