COPENHAGEN, DENMARK - APRIL 16: Crown Prince Frederik, and Crown Princess Mary of Denmark, with their children, Princess Josephine, Princess Isabella, Prince Vincent and Prince Christian appear on the Balcony of Amalienborg Palace on The 75th Birthday of Queen Margrethe II of Denmark, on April 16, 2015 in Copenhagen, Denmark.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - APRIL 16: Crown Prince Frederik, and Crown Princess Mary of Denmark, with their children, Princess Josephine, Princess Isabella, Prince Vincent and Prince Christian appear on the Balcony of Amalienborg Palace on The 75th Birthday of Queen Margrethe II of Denmark, on April 16, 2015 in Copenhagen, Denmark.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - APRIL 16: Crown Prince Frederik, and Crown Princess Mary of Denmark, with their children, Princess Josephine, Princess Isabella, Prince Vincent and Prince Christian appear on the Balcony of Amalienborg Palace on The 75th Birthday of Queen Margrethe II of Denmark, on April 16, 2015 in Copenhagen, Denmark.(Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

COPENHAGEN, DENMARK - APRIL 16: Crown Prince Frederik of Denmark and Crown Princess Mary of Denmark with Prince Christian of Denmark, Prince Vincent of Denmark, Princess Isabella of Denmark and Princess Josephine of Denmark on the balcony at Amalienborg Palace during festivities for the 75th birthday of Queen Margrethe II Of Denmark on April 16, 2015 in Copenhagen, Denmark. (Photo by Mark Cuthbert/UK Press via Getty Images)
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UK Press Mark Cuthbert