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The wedding of Princess Margrethe (later Margrethe II of Denmark) to French diplomat Henri de Laborde de Monpezat in Copenhagen, 10th June 1967. With them on the balcony are the bride's parents, King Frederick IX (right) and Queen Ingrid. (Photo by David Cairns/Express/Getty Images)

The wedding of Princess Margrethe (later Margrethe II of Denmark) to French diplomat Henri de Laborde de Monpezat in Copenhagen, 10th June 1967. With them on the balcony are the bride's parents, King Frederick IX (right) and Queen Ingrid. (Photo by David Cairns/Express/Getty Images)

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Princess Margarethe of Denmark with her father King Frederick IX waving to crowds on her wedding day in Copenhagen on 10th June 1967. (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Margarethe of Denmark with her father King Frederick IX waving to crowds on her wedding day in Copenhagen on 10th June 1967.  (Photo by Ray Bellisario/Popperfoto/Getty Images)

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YOGYAKARTA, INDONESIA - OCTOBER 24: Queen Margrethe II of Denmark and her husband, Prince Henrik talk to journalist during their visit at Prambanan temple on October 24, 2015 in Yogyakarta, Indonesia. Queen Margrethe II of Denmark and her husband, Prince Henrik, embarked upon a state visit to Indonesia to mark 65 years of diplomatic relations. (Photo by Ulet Ifansasti/Getty Images)

YOGYAKARTA, INDONESIA - OCTOBER 24:  Queen Margrethe II of Denmark and her husband, Prince Henrik talk to journalist during their visit at Prambanan temple on October 24, 2015 in Yogyakarta, Indonesia. Queen Margrethe II of Denmark and her husband, Prince Henrik, embarked upon a state visit to Indonesia to mark 65 years of diplomatic relations.  (Photo by Ulet Ifansasti/Getty Images)

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LUZECH, FRANCE - JUNE 11: Queen Margrethe II of Denmark and Prince Henrik of Denmark attends a Photocall at Chateau de Cayx on June 11, 2014 in Luzech, France. (Photo by Mark Cuthbert/UK Press via Getty Images)

LUZECH, FRANCE - JUNE 11:   Queen Margrethe II of Denmark and Prince Henrik of Denmark attends a Photocall at Chateau de Cayx on June 11, 2014 in Luzech, France.  (Photo by Mark Cuthbert/UK Press via Getty Images)

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Queen Margrethe Of Denmark , And Prince Henrik, With Grandchildren, Prince Vincent, And Princess Josephine Attend A Photocall For The Danish Royal Family At Grasten Castle In Southern Denmark. (Photo by Julian Parker/UK Press via Getty Images)

Queen Margrethe Of Denmark , And Prince Henrik, With Grandchildren, Prince Vincent, And Princess Josephine Attend A Photocall For The Danish Royal Family At Grasten Castle In Southern Denmark. (Photo by Julian Parker/UK Press via Getty Images)