LUXEMBOURG - JUNE 23: Princess Claire of Luxembourg and Prince Felix of Luxembourg arrive for Te Deum for National Day at Notre Dame du Luxembourg cathedral on June 23, 2018 in Luxembourg, Luxembourg. (Photo by Sylvain Lefevre/Getty Images )
LUXEMBOURG - JUNE 23: Princess Claire of Luxembourg and Prince Felix of Luxembourg arrive for Te Deum for National Day at Notre Dame du Luxembourg cathedral on June 23, 2018 in Luxembourg, Luxembourg. (Photo by Sylvain Lefevre/Getty Images )