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Photos of Mary-Kate and Ashley Olsen, Can You Tell The Olsen Twins Apart?

Mary-Kate and Ashley Are 23 Today, Can You Tell Them Apart?

Happy Birthday to Mary-Kate and Ashley Olsen! To celebrate their big day, Fab put together an awesome slideshow of photos of the girls, while we're ready to test out your skills at telling them apart. So what do you think — can you tell the difference between Mary-Kate and Ashley Olsen? Click here to get guessing!

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