On January 31, 2022, a Royal Decree was signed by King Philippe, Prime Minister Alexander De Croo and Minister of Justice Vincent Van Quickenborne granting consent to Princess Maria Laura's planned marriage to William Isvy.
In Dutch:
In French:
Translation:
The consent as foreseen in Article 85, second paragraph, of the Constitution is given for the marriage of Her Royal Highness Princess Maria Laura d'Autriche-Este (Habsbourg-Lorraine), Princess of Belgium, to Mr. William Isvy.
The predicate and qualification HRH Princess and the title Princess of Belgium are applied to Princess Maria Laura, consistent with the usage of her parents and siblings. But unlike past usage for her parents and siblings, her legal surname "d'Autriche-Este (Habsbourg-Lorraine)" was put into this decree. For further details and some discussion, please see the following thread.
Titles of the Belgian Royal Family
It is interesting to compare the timing of the decrees by which royal marriages have been authorized.
Prince Philippe's engagement was announced on September 10, 1999. King Albert II signed the decree authorizing his son's marriage on September 19, 1999, a delay of nine days.
Prince Laurent's engagement was announced on December 19, 2002. King Albert II signed the decree authorizing his son's marriage on the very same day.
Prince Amedeo requested permission for his marriage September 20, 2015. King Philippe signed the decree granting retroactive approval for the marriage on November 12, 2015, a delay of almost two months.
Princess Maria Laura's engagement was announced on December 27, 2021. King Philippe signed the decree approving her marriage January 31, 2022, a delay of one month.
I wonder why King Philippe has taken longer to grant approval for marriages than his father did.