Britain's Catherine, Duchess of Cambridge (C), Prince Guillaume (2ndR), Hereditary Grand Duke of Luxembourg, and Princess Stephanie (2ndL), Hereditary Grand Duchess of Luxembourg, walk as they take part in the Celebration of the 150th anniversary of the 1867 Treaty of London in Luxembourg, on May 11, 2017. / AFP PHOTO / JOHN THYS (Photo credit should read JOHN THYS/AFP/Getty Images)
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