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THE HAGUE, NETHERLANDS - NOVEMBER 29: Queen Mathilde of Belgium (R) 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 (R) 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)

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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)

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Queen Maxima of the Netherlands (C-R) and Queen Mathilde of Belgium speak with staff during a visit to the Vitalis non-profit organisation in The Hague on November 29, 2016. / AFP / ANP / Frank van Beek / Netherlands OUT (Photo credit should read FRANK VAN BEEK/AFP/Getty Images)

Queen Maxima of the Netherlands (C-R) and Queen Mathilde of Belgium speak with staff during a visit to the Vitalis non-profit organisation in The Hague on November 29, 2016. / AFP / ANP / Frank van Beek / Netherlands OUT        (Photo credit should read FRANK VAN BEEK/AFP/Getty Images)

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THE HAGUE, NETHERLANDS - NOVEMBER 29: Queen Mathilde of Belgium and Queen Maxima of the Netherlands (L) 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 and Queen Maxima of the Netherlands (L) 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)

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Dutch Queen Maxima (L) and Belgian Queen Mathilde (R) visit the Cobra Museum in Amstelveen, The Netherlands, on November 29, 2016. / AFP / ANP / Robin van Lonkhuijsen / Netherlands OUT (Photo credit should read ROBIN VAN LONKHUIJSEN/AFP/Getty Images)

Dutch Queen Maxima (L) and Belgian Queen Mathilde (R) visit the Cobra Museum in Amstelveen, The Netherlands, on November 29, 2016.  / AFP / ANP / Robin van Lonkhuijsen / Netherlands OUT        (Photo credit should read ROBIN VAN LONKHUIJSEN/AFP/Getty Images)