During the teen sitcom’s six seasons, the show has welcomed to its show-within-a-show one celeb after another, among them First Lady Michelle Obama, Jane Lynch, Jack Black — and now Jimmy Fallon.
“Jimmy’s [late-night] show is part of the episode we just filmed in New York, and he’s the coolest guy in the world,” Munck tells TVLine. “Hands down, he was my favorite guest star. I’m such a big fan, and he was so funny and fun to work with.”
Of course, Munck’s character couldn’t take advantage of such an exciting opportunity without being faced with an equally embarrassing problem.
“Gibby removes his clothes a lot on the show, but on that episode, he has a serious wardrobe malfunction,” his portrayer reveals. “It’s not more so than usual, but it’s different — definitely fun.”

http://tvline.com/2012/05/22/icarly-final-season-noah-munck-nickelodeon-jimmy-fallon/#more-332008