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 recently appeared in "Kill Your Darlings" and "Oldboy," and has joined the all-star cast of the 2015 movie "The Avengers: Age of Ultron." —XFINITY Entertainment Staff (Photo by Theo Wargo/Getty Images)
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