Re: Britney Spears onstage at 2006 Teen Choice Awards (08/20/2006)
They're like nervous tics, indicators that she's nervous, uncomfortable, or self-conscious (my guess is because she knows she's putting on a facade of "everything's great, I'm so happy!" that even she doesn't believe.)
Anyone who's had to go through a public speaking class will recognize this. There's all sorts of reflexive mannerisms (accents, expressions, gestures) that help a person cope with their nervousness or insecurity, and many times they don't even notice they're doing them, but actually only make it more obvious how nervous they are. That probably explains her hideous gum-chomping, too. That and a serious bad habit/lack of manners.
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