Anyone who doesn't believe that teenage girls can turn into screaming ninnies when a teen idol shows up has obviously never seen any videos of the Jonas Brothers, New Kids On the Block, or any other crap pop group.

Actually, they've done it for good groups, too- watch the first appearance of the Beatles on Ed Sullivan. There's a reason this became a cliche- because it happens.

(I've been known to squee a bit myself at times.)