LUXEMBOURG - JUNE 30: Prince Sebastien, Princess Alexandra (sons of the Grand Duke Henri and Grand Duchess Maria Teresa) Princess Sibilla and Prince Guillaume of Luxembourg The festivities marking the 25th wedding anniversary of Grand Duke Henri and Grand Duchess Maria Teresa will start with a show entitled 'Homage' at the Grand Theatre featuring a host of Luxembourg artists 900 guests will attend including numerous members of royal households (Local Caption: 00134587) in Luxembourg on June 30, 2006. (Photo by Alain BENAINOUS/Gamma-Rapho via Getty Images)
