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Meet The World's Royal Teenagers

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December 24, 2016 - Chris Jackson/Getty Images Europe more pics like this »
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18. Lady Louise Windsor
Lady Louise Windsor is Queen Elizabeth II's youngest granddaughter. The 17-year-old is the eldest child and only daughter of Sophie, Countess of Wessex and Prince Edward, Queen Elizabeth II's youngest child.

While Lady Louise mainly stays out of the public eye, you might recognize her from an important wedding: she was one of the very young bridesmaids at Prince William and Kate Middleton's 2011 wedding.