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Princess Margarethe of Denmark and her new husband, Henri de Monpezat, His Royal Highness Prince Henrik of Denmark, after their wedding in Copenhagen on 10th June 1967. (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Margarethe of Denmark and her new husband, Henri de Monpezat, His Royal Highness Prince Henrik of Denmark, after their wedding in Copenhagen on 10th June 1967.   (Photo by Ray Bellisario/Popperfoto/Getty Images)

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Princess Margarethe of Denmark (foreground, left) with her new husband, Henri de Monpezat, Prince Henrik of Denmark, on their wedding day in Copenhagen on 10th June 1967. (Photo by Ray Bellisario/Popperfoto/Getty Images)

Princess Margarethe of Denmark (foreground, left) with her new husband, Henri de Monpezat, Prince Henrik of Denmark, on their wedding day in Copenhagen on 10th June 1967.  (Photo by Ray Bellisario/Popperfoto/Getty Images)

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DENMARK - OCTOBER 14: Princess Margrethe, later Queen Margrethe II, weds Prince Henrik in Copenhagen. Prince Henrik was formerly French diplomat Count Henri de Monpezat. (Photo by SSPL/Getty Images)

DENMARK - OCTOBER 14:  Princess Margrethe, later Queen Margrethe II, weds Prince Henrik in Copenhagen. Prince Henrik was formerly French diplomat Count Henri de Monpezat.  (Photo by SSPL/Getty Images)

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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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The wedding of Princess Margrethe (later Margrethe II of Denmark) to French diplomat, Henri de Laborde de Monpezat in Copenhagen, 10th June 1967. (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. (Photo by David Cairns/Express/Getty Images)