AARHUS, DENMARK - APRIL 8: Crown Princess Mary, and Princess Isabella of Denmark, attend a Gala Night to mark the forthcoming 75th Birthday of Queen Margrethe II of Denmark at Aarhus Concert Hall on April 8, 2015 in Aarhus, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

AARHUS, DENMARK - APRIL 8: Crown Princess Mary and Princess Isabella of Denmark attend a Gala Night to mark the forthcoming 75th Birthday of Queen Margrethe II of Denmark at Aarhus Concert Hall on April 8, 2015 in Aarhus, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

AARHUS, DENMARK - APRIL 8: Crown Princess Mary of Denmark attends a Gala Night to mark the forthcoming 75th Birthday of Queen Margrethe II of Denmark at Aarhus Concert Hall on April 8, 2015 in Aarhus, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

AARHUS, DENMARK - APRIL 8: Princess Isabella of Denmark attends a Gala Night to mark the forthcoming 75th Birthday of Queen Margrethe II of Denmark at Aarhus Concert Hall on April 8, 2015 in Aarhus, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker

AARHUS, DENMARK - APRIL 8: Prince Christian of Denmark attends a Gala Night to mark the forthcoming 75th Birthday of Queen Margrethe II of Denmark at Aarhus Concert Hall on April 8, 2015 in Aarhus, Denmark. (Photo by Julian Parker/UK Press via Getty Images)
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UK Press Julian Parker