|copyright: Grand Ducal Court|
His 28-year-old fiancee, Countess Stéphanie de Lannoy, said the relationship "gives me great pleasure."
Cameras focuses on the rather large diamond ring on her finger.
Stéphanie said she was looking forward to discover Luxembourg and learning Luxembourgish. She has already started lessons. "I have a very effective teacher," she said, laughing, as she looked at her fiance.
Before the "betrothal covenant was made," Guillaume introduced Stéphanie to representatives of state institutions at a reception for 40 people at the Grand Ducal Palace. This was followed by a private lunch at Schloss Berg, which was attended Guillaume and Stéphanie's families.
The wedding will take place later this year, but not on September 8, which is when Guillaume's first cousin, Archduke Imre marries American Kathleen Walker. They will be married at Mary the Mother of God Roman Catholic Church in Washington, D.C.