The talk show host turned the big 4-0, so you know the celebration was going to be special.
But who knew that Seth would jump out of a giant cake, shirtless… and presumably bottomless as well, although the audience was spared any embarrassment.
So, out rolled this huge cake and Jimmy was flabbergasted. “I don’t know what to do… do I knock?” he mutters.
But Seth saved him the trouble and flipped open the top and popped up with a cascade of balloons.
“Dude, I know you don’t like surprises, so first, I’m gonna say happy birthday, and second…”
“You’re under arrest!” yelled Franco as he popped up, also shirtless, wearing a police hat and a bow tie like male strippers.
But the real surprise was lurking behind the curtain.
Check out the hilarious video below, wish Jimmy a happy birthday and be sure to follow IM on Twitter for the latest celebrity news.