Grand Duchess Stéphanie, Duchess of Nassau, born on 18 February 1984 in Renaix (Belgium), is the youngest of eight children of Count de Lannoy († 10 January 2019) and Countess de Lannoy, née Alix della Faille de Leverghem († 26 August 2012). She grew up on the family estate in Anvaing, in the Belgian province of Hainaut.

On 20 October 2012, Countess Stéphanie de Lannoy married His Royal Highness Hereditary Grand Duke Guillaume at Notre-Dame Cathedral in Luxembourg City, thereby becoming Hereditary Princess of Luxembourg. Upon Grand Duke Guillaume’s accession to the throne on 3 October 2025, she became Grand Duchess.

The Grand Duchess attended primary school at Sancta Maria in Renaix, Belgium. She began her secondary education at Collège Sainte-Odile in northern France and continued at the Institut de la Vierge Fidèle in Brussels, where she graduated in 2002. At the age of 18, she spent a year in Moscow, where she took courses in Russian language and literature, while also pursuing her violin studies. In addition to her mother tongue, French, Grand Duchess Stéphanie is fluent in Luxembourgish, German and English.

She graduated with honours in Germanic philology from the Catholic University of Louvain. As part of her degree, she completed her thesis at the Humboldt University of Berlin on the influence of German Romanticism on Russian Romanticism, with particular reference to E.T.A. Hoffmann and Pushkin. She extended her stay in Berlin with an internship at the Walloon Export Agency and later worked for an investment company.

During her and her husband’s stay in London in 2018 and 2019, she also studied art history at Sotheby’s Institute.

The Grand Duchess generally carries out her activities alongside her husband, reflecting the close bond between the couple.

During official events such as the National Day celebrations, New Year’s receptions and State Visits, she fulfils her representative duties with great naturalness and spontaneity.

Princess Stéphanie frequently accompanied her husband on the many economic missions he chaired as Hereditary Grand Duke, led by the Minister for the Economy, whether in Africa, Asia, the United States or Europe. She also joins the Grand Duke at numerous commemorations and supports him in his activities both in the Grand Duchy and abroad.

Her Royal Highness also takes a close interest in developments in organic farming. She is particularly attentive to potential improvements in production systems aimed at achieving a more sustainable ecological footprint. Together with her husband, she regularly visits local organic farmers and takes part in academic sessions on the subject.

She has since devoted herself to promoting and highlighting the value of art and craftsmanship. Grand Duchess Stéphanie greatly enjoys meeting artists and engaging in exchanges with them, and she is committed to promoting Luxembourgish art both nationally and internationally.

Her interests span all fields of art - from ancient to contemporary, painting to the decorative arts, fine crafts, and photography.

In 2016, she assumed the presidency of the board of directors of the Musée d’Art Moderne Grand-Duc Jean (MUDAM). At the conclusion of her mandate in 2021, she accepted the role of Honorary President honoured to remain closely associated with the museum.

Concerned by the decline of traditional craftsmanship in Europe and in Luxembourg, Princess Stéphanie and Prince Guillaume organised an exhibition in 2016 aimed at revitalising the Luxembourgish crafts sector.

Following the great success of this first edition, they decided to continue their commitment to creators and artisans by launching the association De Mains de Maîtres Luxembourg the following year. The exhibition has since become a recurring event in the form of a biennale, which also highlights the craftsmanship of different guest countries in each edition.

The association De Mains de Maîtres Luxembourg remains highly active in its mission to support artisans, organising international exhibitions, awarding scholarships, hosting pop-up stores, and more - all with the aim of supporting established professionals in the field while encouraging young people to take up the challenge of artistic craftsmanship.

The Grand Duchess has always nurtured a keen interest in classical music. From an early age, with the encouragement of her parents, she studied music theory and learned to play the piano, later taking up the violin. As a teenager, she developed a passion for reading. Her study of foreign languages enabled her to discover and enjoy classical authors in their original languages.

Since the birth of Prince Charles and Prince François, Grand Duchess Stéphanie has embraced her role as a mother with great joy. She particularly cherishes the simple, intimate moments spent with her family. Deeply committed to this responsibility, she and her husband wish to raise their sons with an education grounded in the family values and spirit of respect that they share.