Happy Birthday, Allison Williams! The actress best known for her role as Marnie Michaels on HBO's Girls turns 26 today, and what a year she's had. The third season of Girls premiered to record audiences, and in February Williams got engaged to her boyfriend of three years, Ricky Van Veen (see the ring here). If that wasn't enough, Williams ladylike style and glamorous beauty choices have been landing her on countless best-dressed lists (including InStyle Fashion News Director Eric Wilson's!) and even nabbed her a spot as a guest judge on an episode of Project Runway.