Grand Duke Henri is pictured with Grand Duchess Maria-Teresa and Prince Sébastien in this 2017 archive photo Cour Grand Ducale/Lola-Velasco

Grand Duke Henri is pictured with Grand Duchess Maria-Teresa and Prince Sébastien in this 2017 archive photo Cour Grand Ducale/Lola-Velasco

The pair celebrate their sixty-fourth and twenty-seventh birthdays, respectively.

Prince Sébastien graduated as an officer from Sandhurst Royal Military school in the UK in 2017.

According to the Luxembourg royal website monarchie.lu, more recently the prince spent three months in New Zealand before returning to find work in the sustainable energy sector. He’s also a keen rugby player, having played for the Luxembourg national team as well as his university team.