Spanish Crown Prince Felipe (2nd R) and his wife Princess Letizia (2ndL) pose with their daughters Infanta Sofia (L) and Infanta Leonor in his official residence in Madrid August 1, 2012 in this picture released by Spanish Royal House. Spanish Princess Letizia celebrates her 40th birthday on September 15.[Photo/Agencies]

Spanish Crown Prince Felipe (R) holds his daughter Infanta Leonor as his wife Princess Letizia (L) and their daughter Infanta Sofia (2nd L) rest in his official residence in Madrid August 1, 2012 in this picture released by Spanish Royal House.Spanish Princess Letizia celebrates her 40th birthday on September 15.[Photo/Agencies]