19. MICHELLE WILLIAMS

No one expected Jen from Dawson's Creek to make the A-list, but now, she's a two-time Academy Award-nominated actress, with an anticipated third nod for her compelling turn as the beloved yet broken Marilyn Monroe in My Week with Marilyn. Earlier this year, she earned an Oscar nomination for Blue Valentine and she's already won number of "Best Actress" awards for the Marilyn role.