Britain's Catherine, Duchess of Cambridge (C) smiles as she arrives with Belgian Countess and wife of Hereditary Grand-Duke of Luxembourg Stephanie de Lannoy (2L) during 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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