Why do models wear frowns with high fashion?

VIDEO CNN's Jeanne Moos finds the fashion runways are too cool for friendly grins Play video (QuickTime, Real or Windows Media)

NEW YORK (CNN) -- They flounce and they prance as they travel down catwalks at fashion shows, but these models of haute couture rarely smile.

It seems the higher the price of the designer clothes, the more likely the models are to frown while wearing the fashionable outfits.

Watch as Jeanne Moos tries to uncover this mystery of somber faces on gorgeous girls.

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