COPENHAGEN, DENMARK - MARCH 18: King Willem-Alexander, and Queen Maxima of the Netherlands with Crown Princess Mary, and Crown Prince Frederik of Denmark at The Black Diamond in Copenhagen where King Willem-Alexander, and Queen Maxima of the Netherlands host a return arrangement, during their State visit to Denmark, on March 18, 2015 in Copenhagen, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - MARCH 18: King Willem-Alexander, and Queen Maxima of the Netherlands with Crown Princess Mary, and Crown Prince Frederik of Denmark at The Black Diamond in Copenhagen where King Willem-Alexander, and Queen Maxima of the Netherlands host a return arrangement, during their State visit to Denmark, on March 18, 2015 in Copenhagen, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - MARCH 18: Queen Maxima of the Netherlands and Crown Princess Mary of Denmark at The Black Diamond in Copenhagen where King Willem-Alexander, and Queen Maxima of the Netherlands host a return arrangement, during their State visit to Denmark, on March 18, 2015 in Copenhagen, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - MARCH 18: Queen Maxima of the Netherlands with Crown Princess Mary, and Crown Prince Frederik of Denmark at The Black Diamond in Copenhagen where King Willem-Alexander, and Queen Maxima of the Netherlands host a return arrangement, during their State visit to Denmark, on March 18, 2015 in Copenhagen, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - MARCH 18: Crown Princess Mary of Denmark arrives at The Black Diamond in Copenhagen, where King Willem-Alexander, and Queen Maxima of the Netherlands host a return arrangement, during their State visit to Denmark, on March 18, 2015 in Copenhagen, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker