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.

[7] While in Berlin, Stéphanie worked as an intern at the Walloon Export and Foreign Investment Agency under the sponsorship of the Belgian Embassy.

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).

[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.