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Wedding of Margrethe of Denmark and Henri de Montpezat at Holmen church in Copenhagen. (Photo by API/Gamma-Rapho via Getty Images)

Wedding of Margrethe of Denmark and Henri de Montpezat at Holmen church in Copenhagen. (Photo by API/Gamma-Rapho via Getty Images)

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La princesse Margrethe et son époux le prince Henrik traversent la ville en calèche et saluent la foule, à Copenhague, Danemark, le 11 juin 1967. (Photo by KEYSTONE-FRANCE/Gamma-Rapho via Getty Images)

La princesse Margrethe et son époux le prince Henrik traversent la ville en calèche et saluent la foule, à Copenhague, Danemark, le 11 juin 1967. (Photo by KEYSTONE-FRANCE/Gamma-Rapho via 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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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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Princess Margrethe with her father King Frederik IX of Denmark before her wedding with Henri Marie Jean Andre, Count of Laborde de Monpezat at Holmens Kirke in Copenhagen on June 10, 1967. (Photo by Keystone/Getty Images)

Princess Margrethe with her father King Frederik IX of Denmark before her wedding with Henri Marie Jean Andre, Count of Laborde de Monpezat at Holmens Kirke in Copenhagen on June 10, 1967. (Photo by Keystone/Getty Images)