Britain's Catherine, Duchess of Cambridge (C), Princess Stephanie (R), Hereditary Grand Duchess of Luxembourg, and Prince Guillaume (L), Hereditary Grand Duke of Luxembourg attend the Celebration of the 150th anniversary of the 1867 Treaty of London in Luxembourg on May 11, 2017. / AFP PHOTO / EMMANUEL DUNAND (Photo credit should read EMMANUEL DUNAND/AFP/Getty Images)
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AFP EMMANUEL DUNAND