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BRUSSEL, BELGIUM - JULY 20: Queen Mathilde of Belgium and King Philippe of Belgium arrive for a prelude concert by the Belgian National Orchestra on the eve of Belgian National Day, on July 20, 2015 in Brussel, Belgium. (Photo by Patrick Aventurier/Getty Images)

BRUSSEL, BELGIUM - JULY 20:  Queen Mathilde of Belgium and King Philippe of Belgium arrive for a prelude concert by the Belgian National Orchestra on the eve of Belgian National Day, on July 20, 2015 in Brussel, Belgium.  (Photo by Patrick Aventurier/Getty Images)