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THE HAGUE, NETHERLANDS - OCTOBER 11: Catherine, Duchess of Cambridge views the 'Girl with a Pearl Earring' by Johannes Vermeer as she visits the Mauritshuis Gallery during a solo visit to the Hague on October 11, 2016 in the Hague, Netherlands. (Photo by Arthur Edwards - Pool/Getty Images)

THE HAGUE, NETHERLANDS - OCTOBER 11: Catherine, Duchess of Cambridge views the 'Girl with a Pearl Earring' by Johannes Vermeer as she visits the Mauritshuis Gallery during a solo visit to the Hague on October 11, 2016 in the Hague, Netherlands.  (Photo by Arthur Edwards - Pool/Getty Images)