Allison Williams's Red Carpet Looks
Credit: Jason LaVeris/FilmMagic

Happy birthday, Allison Williams! The Girls star is ringing in her 27th birthday today. In less than a decade, Williams has not only made a name for herself on the small screen with roles on the hit HBO show and the live-action TV adaptation of Peter Pan, but has earned the title of red carpet superstar after years of head-turning gowns from Giambattista Valli (above), Alexander McQueen, Valentino, and more. In honor of her birthday, we're taking a look back at her standout looks on the red carpet.PHOTOS: Allison Williams's Best Red Carpet Looks