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King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) leave the Vatican after a private audience with the Pope, 12th June 1950. (Photo by Keystone/Hulton Archive/Getty Images)

King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) leave the Vatican after a private audience with the Pope, 12th June 1950. (Photo by Keystone/Hulton Archive/Getty Images)

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Ex-King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) return to Brussels after their car crash in Cortina, Italy, 24th July 1957. The couple escaped serious injury when their car, driven by the Princess, turned over when coming off the road. (Photo by Keystone/Hulton Archive/Getty Images)

Ex-King Leopold III of Belgium (1901 - 1983) and Princess Lilian of Belgium (1916 - 2002) return to Brussels after their car crash in Cortina, Italy, 24th July 1957. The couple escaped serious injury when their car, driven by the Princess, turned over when coming off the road.  (Photo by Keystone/Hulton Archive/Getty Images)

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Princess Lilian of Belgium (1916 - 2002) at London Airport, March 1967. (Photo by George Stroud/Daily Express/Hulton Archive/Getty Images)

Princess Lilian of Belgium (1916 - 2002) at London Airport, March 1967. (Photo by George Stroud/Daily Express/Hulton Archive/Getty Images)

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Queen Anne of Romania (left) and Princess Lilian of Belgium (1916 - 2002) followed by King Michael I of Romania and Simeon II of Bulgaria, attend a banquet given by the Belgian government at the Royal Palace of Brussels, 14th December 1960. The banquet is taking place for the guests who will be attending the wedding of King Baudouin of Belgium and Dona Fabiola de Mora y Aragon the following day. (Photo by Central Press/Hulton Archive/Getty Images)

Queen Anne of Romania (left) and Princess Lilian of Belgium (1916 - 2002) followed by King Michael I of Romania and Simeon II of Bulgaria, attend a banquet given by the Belgian government at the Royal Palace of Brussels, 14th December 1960. The banquet is taking place for the guests who will be attending the wedding of King Baudouin of Belgium and Dona Fabiola de Mora y Aragon the following day. (Photo by Central Press/Hulton Archive/Getty Images)

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The family has gathered to celebrate the 80th birthday of Queen Elisabeth of Belgium (centre) at the Royal Castle of Laeken. Seated L - R are Princess Lilian of Belgium (1916 - 2002), Queen Elisabeth of Belgium (1876 - 1965), Princess Maria Pia of Savoy. Standing behind L - R are Princess Maria Beatrice of Savoy, Ex-Queen Marie Jose of Italy (1906 - 2001), Prince Alexander of Yugoslavia, King Baudouin of Belgium (1930 - 1993), Ex-King Leopold III of Belgium (1901 - 1983), Vittorio Emanuele, Prince of Naples, Ex-King Umberto II of Italy (1904 - 1983), Prince Albert of Belgium, later King Albert II of Belgium, Princess Josephine Charlotte of Belgium (1927 - 2005), Grand Duke Jean of Luxembourg, Princess Maria Gabriella of Savoy, and Prince Alexander of Belgium (1942 - 2009), Brussels, 25th July 1956. (Photo by Central Press/Hulton Archive/Getty Images)

The family has gathered to celebrate the 80th birthday of Queen Elisabeth of Belgium (centre) at the Royal Castle of Laeken. Seated L - R are Princess Lilian of Belgium (1916 - 2002),  Queen Elisabeth of Belgium (1876 - 1965), Princess Maria Pia of Savoy. Standing behind L - R are Princess Maria Beatrice of Savoy, Ex-Queen Marie Jose of Italy (1906 - 2001), Prince Alexander of Yugoslavia, King Baudouin of Belgium (1930 - 1993), Ex-King Leopold III of Belgium (1901 - 1983), Vittorio Emanuele, Prince of Naples, Ex-King Umberto II of Italy (1904 - 1983), Prince Albert of Belgium, later King Albert II of Belgium, Princess Josephine Charlotte of Belgium (1927 - 2005), Grand Duke Jean of Luxembourg, Princess Maria Gabriella of Savoy, and Prince Alexander of Belgium (1942 - 2009), Brussels, 25th July 1956. (Photo by Central Press/Hulton Archive/Getty Images)