BRUSSELS, BELGIUM - DECEMBER 21:  (L-R) Prince Gabriel, Queen Mathilde of Belgium, Prince Emmanuel, King Philip of Belgium, Princess Eleonore, Princess Elisabeth, Princess Astrid and Prince Lorenz attend the Christmas Concert at the Royal Palace on December 21, 2016 in Brussels, Belgium.  (Photo by Olivier Matthys/Getty Images)
BRUSSELS, BELGIUM - DECEMBER 21:  Prince Gabriel, Queen Mathilde of Belgium, Prince Emmanuel, King Philip of Belgium, Princess Eleonore, Princess Elisabeth, Princes Astrid and Prince Lorenz attend the Christmas Concert at the Royal Palace on December 21, 2016 in Brussels, Belgium.  (Photo by Olivier Matthys/Getty Images)
BRUSSELS, BELGIUM - DECEMBER 21:  (L-R) Prince Lorenz, Princess Elisabeth, Queen Mathilde of Belgium, Prince Emmanuel, Princess Eleonore, King Philip of Belgium and Prince Gabriel attend the Christmas Concert at the Royal Palace on December 21, 2016 in Brussels, Belgium.  (Photo by Olivier Matthys/Getty Images)
BRUSSELS, BELGIUM - DECEMBER 21:  (L-R) Prince Lorenz, Princess Eleonore, Prince Gabriel, Queen Mathilde of Belgium, King Philip of Belgium, Prince Emmanuel and Princes Astrid attend the Christmas Concert at the Royal Palace on December 21, 2016 in Brussels, Belgium.  (Photo by Olivier Matthys/Getty Images)
BRUSSELS, BELGIUM - DECEMBER 21:  (L-R) Prince Lorenz, Princess Elisabeth, Queen Mathilde of Belgium, Prince Emmanuel, Princess Eleonore, King Philip of Belgium and Prince Gabriel attend the Christmas Concert at the Royal Palace on December 21, 2016 in Brussels, Belgium.  (Photo by Olivier Matthys/Getty Images)