Stéphanie Marie Claudine Christine de Lannoy was born on 18 February 1984 in Ronse, East Flanders, Belgium.

[1][2][3] The House of Lannoy has been traced back to the 13th-century nobility of Hainaut, its members distinguishing themselves in military command and affairs of state.

[5] Stéphanie attended the Dutch-language Sancta Maria de Ronse school and continued her education at Collège Saint-Odile in France.

She then returned to Brussels for studies at L'Institut de la Vierge Fidèle, before taking up Russian language and literature in Moscow for a year.

She decided not to hold dual citizenship of Belgium and Luxembourg: "As the Hereditary Grand Duchess, I am proud to share my husband's nationality.

[6] Since June 2012, Hereditary Grand Duchess Stéphanie has been a member of the board of directors of the Fondation du Grand-Duc et de la Grande-Duchesse.

[6] In 2014, she became the patron to the Scienteens Lab,[15] a biomedical research laboratory for secondary school students founded by the Luxembourg Center for Systems Biomedicine (LCSB).

[6] Princess Stéphanie regularly visits local organic agricultural producers and participates in academic sessions on the subject.

[19] At each of their visits, the couple expressed their gratitude to the staff of the nursing homes for their efforts in maintaining a warm environment for the residents throughout the pandemic.