With her career in the Luxembourg Army, she has participated in missions in Yugoslavia and Kosovo. During her mission in Yugoslavia, she met Prince Louis, who was there visiting the Luxembourg troops.
She and Prince Louis were married on 29 September 2006. Upon their marriage, the prince gave up his succession rights and those of their son Gabriel, and any of the couple's future children, although Prince Louis retains his title of Prince of Luxembourg and the style of Royal Highness while his and Antony's sons were initially given the surname de Nassau with no titles.
Together, they have two sons:
Princess Tessy and her sons were granted the title Prince/ss of Luxembourg during the 2009 National day celebrations. Prior to this, they were Prince/ss de Nassu.