BRUSSELS, BELGIUM - JULY 21: King Philippe of Belgium, Queen Mathilde of Belgium, Princess Elisabeth of Belgium, Prince Gabriel of Belgium, Prince Emmanuel of Belgium and Princess Eleonore of Belgium attend the Te Deum mass on the occasion of the Belgian National Day in the Cathedral on July 21, 2017 in Brussels, Belgium. (Photo by Patrick van Katwijk/Getty Images)
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BRUSSELS, BELGIUM - JULY 21: Queen Mathilde of Belgium, Princess Eleonore of Belgium and Prince Gabriel of Belgium attend the Te Deum mass on the occasion of the Belgian National Day in the Cathedral on July 21, 2017 in Brussels, Belgium. (Photo by Patrick van Katwijk/Getty Images)
BRUSSELS, BELGIUM - JULY 21: Princess Eleonore of Belgium attends the Te Deum mass on the occasion of the Belgian National Day in the Cathedral on July 21, 2017 in Brussels, Belgium. (Photo by Patrick van Katwijk/Getty Images)
BRUSSELS, BELGIUM - JULY 21: Princess Elisabeth of Belgium attends the Te Deum mass on the occasion of the Belgian National Day in the Cathedral on July 21, 2017 in Brussels, Belgium. (Photo by Patrick van Katwijk/Getty Images)
BRUSSELS, BELGIUM - JULY 21: Princess Elisabeth of Belgium and Prince Emmanuel of Belgium attend the Te Deum mass on the occasion of the Belgian National Day in the Cathedral on July 21, 2017 in Brussels, Belgium. (Photo by Patrick van Katwijk/Getty Images)