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At Zac Posen's star-studded show Thursday night, Diddy paced the runway like a nervous dad, shaking hands and darting backstage at the last minute to offer good luck. But the music mogul and financial backer of Posen's line needn't have worried: This was the young designer's best collection and one of the most blissfully creative of the week, inspired by a kooky collision of Japanese design and Esther Williams glamour.