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COPENHAGUE, DANEMARK - SEPTEMBRE: Le prince héritier Frédéric de Danemark et sa femme la princesse Ingrid de Suède photographiés avec leur première fille, la princesse Margrethe, en septembre 1940 à Copenhague, Danemark. (Photo by Keystone-France\Gamma-Rapho via Getty Images)

COPENHAGUE, DANEMARK - SEPTEMBRE: Le prince héritier Frédéric de Danemark et sa femme la princesse Ingrid de Suède photographiés avec leur première fille, la princesse Margrethe, en septembre 1940 à Copenhague, Danemark.  (Photo by Keystone-France\Gamma-Rapho via Getty Images)

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DENMARK - JANUARY 01: Portrait of Princess MARGRETHE of Denmark around 1941-1943. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

DENMARK - JANUARY 01:  Portrait of Princess MARGRETHE of Denmark around 1941-1943.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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DENMARK - DECEMBER 28: Princess BENEDIKTE and crown Princess MARGRETHE of Denmark attend a Christmas celebration at the Swedish legation of Copenhagen on December 28, 1946. Princess MARGRETHE wears a wreath of candles, abiding by an old Swedish tradition, and BENEDIKTE is dressed as an angel. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

DENMARK - DECEMBER 28:  Princess BENEDIKTE and crown Princess MARGRETHE of Denmark attend a Christmas celebration at the Swedish legation of Copenhagen on December 28, 1946. Princess MARGRETHE wears a wreath of candles, abiding by an old Swedish tradition, and BENEDIKTE is dressed as an angel.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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DENMARK - OCTOBER 19: Danish Princess' ANNE-MARIE (aged 4), MARGRETHE (aged 10) and BENDIKTE (aged 6) on October 19, 1950 in Copenhagen. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

DENMARK - OCTOBER 19:  Danish Princess' ANNE-MARIE (aged 4), MARGRETHE (aged 10) and BENDIKTE (aged 6) on October 19, 1950 in Copenhagen.  (Photo by Keystone-France/Gamma-Keystone via Getty Images)

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circa 1946: Christian X of Denmark (1870 - 1947), King of Denmark from 1912, and of Iceland from 1888, with his wife Queen Alexandrine and their grandchildren. From left, Prince Christian, Princess Elizabeth, (behind queen), Prince Ingolf, (centre back), baby Anne-Marie, Princess Benedicte, (centre, front), and behind the King is Princess Margarethe, later Margarethe II of Denmark. (Photo by Keystone/Getty Images)

circa 1946:  Christian X of Denmark (1870 - 1947), King of Denmark from 1912, and of Iceland from 1888, with his wife Queen Alexandrine and their grandchildren.  From left, Prince Christian, Princess Elizabeth, (behind queen), Prince Ingolf, (centre back), baby Anne-Marie, Princess Benedicte, (centre, front), and behind the King is Princess Margarethe, later Margarethe II of Denmark.  (Photo by Keystone/Getty Images)