Does the world really need another Olsen sister? Up until last weekend, we're fairly certain that most movie-goers would have responded to that question with a resounding "no."

But then Sundance audiences got a chance to see Elizabeth Olsen in her pair of harrowing breakout performances in the indies 'Martha Marcy May Marlene' and 'Silent House.' Faster than you can say "John Stamos," Mary-Kate and Ashley's younger sibling has become the talk of two towns -- Park City, Utah, and Hollywood, Calif.

But who is this blushing young ingenue, a girl whose only screen credits prior to 2011 consisted of cameo roles in her overachieving sisters' direct-to-video and TV movies? Join us after the jump for all you need to know about the Sundance Film Festival's latest rising star.
Martha Marcy May Marlene
Based on 38 critics

A woman (Elizabeth Olsen) struggles to reintegrate into society after fleeing from a cult. Read More