20 of the Greatest 'It' Girls of All Time

Cute, quirky, stylish, sexy—an "It" girl has a number of identifiable qualities, plus a little something that's hard to pin down. Case in point: Parker Posey. Now turning 50, she's still a beloved actress—and the author of a new "self-mythologizing memoir"—but in the 1990s she seemed to be everywhere. Vogue couldn't stop writing about her. Click through for more on Posey and other exemplars of the "It" girl phenomenon both today and in decades past.