Robert Sean Leonard, better known as Dr. James Wilson on House M.D. has that perpetually twinkie look. He turned 40 this year, but carries that baby-face and smooth chest with him into his middle age. Leonard is an accomplished and versatile actor, with strong roles in TV, movies and theater. He’s married to a professional horse racer, and co-founded a theater group with Ethan Hawke, Steve Zahn and Frank Whaley.

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