What do you wear when you're invited to hang with Barack and Michelle Obama? Not red, white or blue! Our favorite celebs went super stylish for the annual White House Correspondent's dinner! Katy Perry left her star-spangled hot suit at home and rocked a green Giambattista Valli gown. Sofia Vergara opted for a form-fitting teal dress by Herve Leger. Hayden Panettiere went the fairy princess route in a chiffon dress by Katherine Kidd. We love Kerry Washington's bold black and white dress. Plus, Julia Louis Dreyfuss and Claire Danes! What did First Lady Michelle Obama wear? You will have to tune in to find out!