Profession: Actress

On HBO's Girls, newcomer Allison Williams plays Marnie, Lena Dunham's character's best friend. With just one look at Williams, the daughter of NBC newscaster Brian Williams, we know it's a safe bet that she's en route to becoming a big star. Not only is Allison a talented enough actress to land a Sunday night HBO series as her first major television gig, but she's also classically gorgeous.