According to the Luxemburger Wort:
The Princess became part of the Grand Ducal family when she married Hereditary Duke Guillaume of Luxembourg…at the “Notre Dame” Cathedral on October 20, 2012.
Formerly Countess Stéphanie de Lannoy, the pretty princess was born on February 18, 1984, in Belgium. She was the eighth child of the Count and Countess de Lannoy and grew up in the family home “Anvaing” in Hainaut.
An accomplished student, Stéphanie speaks French, German and English fluently. She studied language and Russian literature in Moscow for a year where she furthered her violin skills.
Princess Stéphanie is currently learning Luxembourgish.