Royal response from Her Royal Highness princess Tessy of Luxembourg and Their Royal Highnesses Prince Gabriel and Prince Noah de Nassau. The response is handwritten by Their Royal Highnesses and signed by Prince Gabriel and Prince Noah. The letter and photo are in reply to my Easter wishes to Their Royal Highnesses. also on the back of the envelope is a little note thanking me for writing to Prince Gabriel for his birthday. Princess Tessy is the ex-wife of Prince Louis of Luxembourg son of The Grand Duke and Grand Duchess of Luxembourg and Prince Gabriel and Prince Noah are their sons.