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STOCKHOLM, SWEDEN - DECEMBER 12: The royal family (from left to right: Princess Birgitta, Prince Wilhelm, P (rincess Sibylla, King Gustaf Adolf, Princess Margaretha and Princess Desiree) attends the Festival at the Nobel Foundation on December 12, 1960 in Stockholm, Sweden. (Photo by Gamma-Keystone via Getty Images)

STOCKHOLM, SWEDEN - DECEMBER 12: The royal family (from left to right: Princess Birgitta, Prince Wilhelm, P (rincess Sibylla, King Gustaf Adolf, Princess Margaretha and Princess Desiree) attends the Festival at the Nobel Foundation on December 12, 1960 in Stockholm, Sweden. (Photo by Gamma-Keystone via Getty Images)