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(Original Caption) Philippe of Belgium and his fiancee Mathilde d'Udekem d'Acoz. (Photo by Reuter Raymond/Sygma via Getty Images)

(Original Caption) Philippe of Belgium and his fiancee Mathilde d'Udekem d'Acoz. (Photo by Reuter Raymond/Sygma via Getty Images)

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(Original Caption) Mathilde d'Udekem d'Acoz, Prince Philippe, Queen Paola and King Albert II. (Photo by Reuter Raymond/Sygma via Getty Images)

(Original Caption) Mathilde d'Udekem d'Acoz, Prince Philippe, Queen Paola and King Albert II. (Photo by Reuter Raymond/Sygma via Getty Images)

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(Original Caption) Philippe of Belgium and his fiancee Mathilde d'Udekem d'Acoz pose in Laeken Park. (Photo by Reuter Raymond/Sygma via Getty Images)

(Original Caption) Philippe of Belgium and his fiancee Mathilde d'Udekem d'Acoz pose in Laeken Park. (Photo by Reuter Raymond/Sygma via Getty Images)

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(Original Caption) The engaged couple in the park of Laeken Chateau after posing for the press. (Photo by Reuter Raymond/Sygma via Getty Images)

(Original Caption) The engaged couple in the park of Laeken Chateau after posing for the press. (Photo by Reuter Raymond/Sygma via Getty Images)

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(Original Caption) Prince Philippe and Mathilde d'Udekem d'Acoz ming le with the crowd near Orval Abbey. (Photo by Reuter Raymond/Sygma via Getty Images)

(Original Caption) Prince Philippe and Mathilde d'Udekem d'Acoz ming le with the crowd near Orval Abbey. (Photo by Reuter Raymond/Sygma via Getty Images)