January 24th, 2011
12:02 AM ET
Who knew Mary-Kate and Ashley Olsen had a younger sister who is an actress? 21-year old beauty Elizabeth Olsen looks so much like her famous siblings, she could be their triplet!
Elizabeth is being called the breakout star of the Sundance Film Festival. The NYU senior has two films here, the horror movie "Silent House", and the drama "Martha Marcy May Marlene".
Elizabeth, who goes by the nickname Lizzie, stopped by our CNN Sundance studio and revealed how her sisters support her, and why she avoided film and fame as a child...
– Advice she's received from Mary-Kate and Ashley: Keep your feet firmly on the ground, head on your shoulders, do what makes you happy and that's the work, nothing else.
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