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BELGIUM - JANUARY 01: King LEOPOLD III of Belgium posing with his new wife and three of his children in 1951. From left to right: King LEOPOLD III, the Princess of RETHY (Lilian BAELS), crown Prince BAUDOIN, Princess JOSEPHINE CHARLOTTE and Prince Albert of Belgium. In that year, King LEOPOLD III (who abdicated in 1944, leaving the throne to his brother CHARLES) marries his second wife Lilian BAELS, the Princess of RETHY (who carries from then on the title of Princess of Belgium) and Prince BAUDOIN becomes BAUDOIN 1st, King of the Belgians. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

BELGIUM - JANUARY 01: King LEOPOLD III of Belgium posing with his new wife and three of his children in 1951. From left to right: King LEOPOLD III, the Princess of RETHY (Lilian BAELS), crown Prince BAUDOIN, Princess JOSEPHINE CHARLOTTE and Prince Albert of Belgium. In that year, King LEOPOLD III (who abdicated in 1944, leaving the throne to his brother CHARLES) marries his second wife Lilian BAELS, the Princess of RETHY (who carries from then on the title of Princess of Belgium) and Prince BAUDOIN becomes BAUDOIN 1st, King of the Belgians. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
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The Belgian royal family enjoy a day out at Laeken, a suburb of Brussels, 1953. Princess Lilian (1916 - 2002) shares a bench with her son Alexander and her daughter Marie-Christine. (Photo by Keystone/Hulton Archive/Getty Images)

The Belgian royal family enjoy a day out at Laeken, a suburb of Brussels, 1953. Princess Lilian (1916 - 2002) shares a bench with her son Alexander and her daughter Marie-Christine. (Photo by Keystone/Hulton Archive/Getty Images)
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King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) with their daughter Princess Marie-Christine of Belgium, in the grounds of the Royal Palace of Laeken, Brussels, circa 1954. (Photo by Jack Esten/Keystone/Hulton Archive/Getty Images)

King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) with their daughter Princess Marie-Christine of Belgium, in the grounds of the Royal Palace of Laeken, Brussels, circa 1954. (Photo by Jack Esten/Keystone/Hulton Archive/Getty Images)
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BELGIUM - JUNE 06: On June 6, 1959, the royal family of Belgium celebrated the 25th birthday of Prince ALBERT. From left to right : King BAUDOUIN, Princess MARIE-CHRISTINE, Princess LILIAN with Princess MARIE-ESMERALDA on her lap, Prince ALBERT, Princess PAOLA, King LEOPOLD and Prince ALEXANDER in the gardens of the Castle de Laeken in Brussels. (Photo by Keystone-France/Gamma-Keystone via Getty Images)

BELGIUM - JUNE 06: On June 6, 1959, the royal family of Belgium celebrated the 25th birthday of Prince ALBERT. From left to right : King BAUDOUIN, Princess MARIE-CHRISTINE, Princess LILIAN with Princess MARIE-ESMERALDA on her lap, Prince ALBERT, Princess PAOLA, King LEOPOLD and Prince ALEXANDER in the gardens of the Castle de Laeken in Brussels. (Photo by Keystone-France/Gamma-Keystone via Getty Images)
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Princess Lilian of Belgium (1916 - 2002) and Ex-King Leopold III of Belgium are among the guests of a hunting party in the Austrian Tyrol, 30th November 1959. (Photo by Keystone/Hulton Archive/Getty Images)

Princess Lilian of Belgium (1916 - 2002) and Ex-King Leopold III of Belgium are among the guests of a hunting party in the Austrian Tyrol, 30th November 1959. (Photo by Keystone/Hulton Archive/Getty Images)
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