STOCKHOLM, SWEDEN - DECEMBER 19: Princess Birgitta and her fiance Prince of Hohenzollern have announced their engagement from the Royal Palace on December 19, 1960 in Stockholm, Sweden. (Photo by Gamma-Keystone via Getty Images)
STOCKHOLM, SWEDEN - DECEMBER 19: Princess Birgitta and her fiance Prince of Hohenzollern have announced their engagement from the Royal Palace on December 19, 1960 in Stockholm, Sweden. (Photo by Gamma-Keystone via Getty Images)