BRUSSELS, BELGIUM - DECEMBER 20: Princess Mathilde and Princess Elisabeth attend the Christmas Concert in the Brussels Palace on December 20, 2006 in Brussels, Belgium. (Photo by Mark Renders/Getty Images)
BRUSSELS, BELGIUM - DECEMBER 20: Princess Mathilde and Princess Elisabeth attend the Christmas Concert in the Brussels Palace on December 20, 2006 in Brussels, Belgium. (Photo by Mark Renders/Getty Images)