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Honorary chairwoman Kate Bosworth is in fit form in a Zac Posen dress at the 3rd Annual TeachersCount spring benefit Tuesday in New York City. But the event, hosted by the designer, didn't go off without a stitch: The actress earlier suffered a wardrobe malfunction. "They sent over a tailor who sewed me in," the Superman Returns star confessed. "I couldn't take this dress off if I tried!"