The master of architecture is equally adept with corsets and infrastructure as he is with delicate draping — and Posen never met a ruffle he didn't love. Though his work is that of an old pro, the designer is in truth still in the early years of his career (he's only 33, after all!). Staging his first show at 21 in 2002, Posen's always been an overachiever; how else could you explain the deeply sultry collections he's managed to create season after season? Despite a brief departure to Paris, this SoHo-raised Parsons graduate is New York through and through. See the runway looks that make us proud to call this designer one of our own and help us wish him a very happy birthday!