News Happy Birthday, Allison Williams! See the Girls Star's Most Memorable Red Carpet Looks By InStyle Editors InStyle Editors Instagram Twitter InStyle's mantra is "Everybody's in," and that means anyone who finds their way to our stories should find themselves reflected in them. We prioritize bringing the right writer to every story and sometimes collaborate as a team to ensure we're including points of view across race, gender expression, body size, skin and hair type, and more. Our editors and writers comprise decades of expertise across the beauty, fashion, lifestyle and wellness spaces in print and digital. We prioritize journalistic integrity, factual accuracy, and also having fun with every story we share. For more about our team, click here. InStyle's editorial guidelines Published on April 13, 2015 Pin Share Tweet Email Photo: 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 Was this page helpful? Thanks for your feedback! Tell us why! Other Submit