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THE HAGUE, NETHERLANDS - NOVEMBER 29: Queen Mathilde of Belgium (L) and Queen Maxima of the Netherlands visit the exhibition Pierre Alechinsky Post Cobra at the Cobra Museum on November 29, 2016 in The Hague, Netherlands. (Photo by Patrick van Katwijk/Getty Images)

THE HAGUE, NETHERLANDS - NOVEMBER 29: Queen Mathilde of Belgium (L) and Queen Maxima of the Netherlands visit the exhibition Pierre Alechinsky Post Cobra at the Cobra Museum on November 29, 2016 in The Hague, Netherlands. (Photo by Patrick van Katwijk/Getty Images)