Spanish Princess Letizia (L), Japanese Crown Prince Naruhito (C) and Spanish Prince Felipe (R) pose upon their arrival to the Thyssen Bornemisza Museum in Madrid, on July 18, 2008. Naruhito is scheduled to attend Expo 2008, an international exposition in the northeastern city of Zaragoza on water and sustainable development, an issue of longstanding interest for the heir to the Chrysanthemum Throne. AFP PHOTO/PIERRE-PHILIPPE MARCOU