It was announced by the Cour Grand-Ducale de Luxembourg that Comtesse Alix de Lannoy, the mother of Comtesse Stéphanie de Lannoy fiancée of His Royal Highness Hereditary Grand Duke Guillaume, has died.
The comtesse suffered a stroke on Sunday, August 26, 2012. She was 70-years old.
Sources: Wort.lu via the Cour Grand-Ducale de Luxembourg
royalcorrespondent.com 
Deepest Condolenses.
Nos plus profonds regrets sur cette triste occasion.
Mlle. Zancy vonHooks