Prim and proper socialite? Check. Handsome, wealthy groom? Check. Storybook wedding shower? Check...? Except that I found my fianc in a closet canoodling with the caterer. And now all of Manhattan's glitterati-my guests-are witness to my humiliation. I've always strived to be the perfect, well-behaved daughter my parents raised. I never draw too much attention, I'm agreeable,...