Karlie Kloss is known for her graceful and fluid style on fashion runways, but every so often even supermodels have their awkward moments. Karlie showed off one of hers on Instagram yesterday, and seemed to enjoy poking fun of herself. The 25-year-old Chicago native, by way of St. Louis, was working out on a treadmill and singing at the same time. Big mistake, apparently.

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Keith Girard
Keith Girard is Editor and Publisher of Celebrity Health & Fitness, a New York City lifestyle Web magazine devoted to health, fitness, diet, beauty and relationships. Before that, he was editor-in-chief of Billboard magazine and a reporter for the Washington Post among other media positions.