Well, we ALL know Kate Upton kinda has an "effect" on guys...including myself. But the most HILARIOUS reaction occurred on Late Night with Jimmy Fallon on Monday night...courtesy of Jimmy Fallon himself. WATCH it all go down here as Kate & Jimmy talk about her very sexy Sports Illustrated cover...

Hahahaha! Jimmy literally turns into a giggling school boy while gawking her, ahem..."goods"! ;) & by far the greatest quote from the interview from Jimmy, "My wife is gonna kill me!" LOL