Famous siblings: Mary-Kate and Ashley Olsen
Is that a third Olsen twin? Not quite. Liz Olsen, the founder and fashion designer of "ethical footwear" for vegans, is the younger sister of the "Full House" stars. Elizabeth recently exploded as a major Hollywood player after her performances in "Martha Marcy May Marlene" and "Silent House." Olsen is set to star in four films this year, including "Kill Your Darlings" and "Oldboy." —XFINITY Entertainment Staff (Photo by Theo Wargo/Getty Images)
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