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Ashley Olsen, Mary-Kate Olsen

Dimitrios Kambouris/Getty Images for Chopard

Twins are in.

Sarah Michelle Geller is returning to the small screen this fall in Ringer, playing a troubled twin who assumes her sister's identity after she goes missing. And ABC Family's The Lying Game follows the life of foster kid Emma, who learns she has an identical twin sister who was adopted by a wealthy family.

But some actors don't have to go far for advice on their double-duty roles. That's right, Hollywood is full of real-life twins.