Didja know about this??  Yea, I didn't know either!

Back in 2001, Jimmy told Paper Magazine, “I really snuck that one in there. When it was all done, no one made fun of me or anything. As a comedian, you don’t really think that you’re good-looking, so when someone asks you if you’d like to model Calvin Klein, you’re like, ‘Oh my God, yes — yes, I want the billboard to be right over the Improv.’ I wanted people walking in to be like, ‘When is it all going to end for that guy? He is the luckiest man on earth.’ I mean, this is ridiculous.”

Read more here:  http://www.hollyscoop.com/jimmy-fallon/jimmy-fallon-s-long-lost-modeling-photos-are-hysterical.html