Princess Astrid is the daughter of Albert II, who was the country’s reigning monarch from 1993 to 2013.
As Mr Isvy is Jewish and the Princess is Catholic, the ceremony incorporated both traditions.
Earlier in the day, Maria wore a Gucci Ivory Wool Silk Cady Crêpe Pleated Dress for her civil ceremony.
She paired her Gucci mini dress with white leather mid-heel pumps with a Horsebit from the same brand.
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