Dutch Prince Celebrates

The Dutch Royal family and guests join in a group photo to mark the 40th birthday of Dutch Crown Prince Willem Alexander at the Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. The heir to the Dutch throne was born April 27, 1967.

Dutch Crown Prince Willem Alexander arrives by carriage with his wife, Princess Maxima, and their daughters, Princess Ariane, second left, Princess Amalia and Princess Alexia, right, to celebrate his 40th birthday at a gala party at the Loo Palace in Apeldoorn, The Netherlands, on Sept. 1, 2007.

Dutch Princess Maxima and Dutch Crown Prince Willem Alexander holding Princess Ariane arrive at the Loo Palace on Sept. 1, 2007, for a party to mark the prince's 40th birthday. The prince married Maxima, an Argentine investment banker in 2002, and they have three daughters.

Dutch Queen Beatrix arrives at the Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands, for the 40th birthday party of her oldest son and heir, Crown Prince Willem Alexander. The queen, who has been on the Dutch throne since 1980, has three sons.

Members of the Dutch royal family pose at Loo Palace on Sept. 1, 2007. From left are Princess Marilene, Prince Maurits, Prince Bernhard, Princess Annette, Princess Margriet, Pieter van Vollenhove, Prince Pieter Christiaan, Princess Anita, Princess Aimee and Prince Floris.

Crown Prince Felipe and Princess Letizia of Spain arrive to attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander on Sept. 1, 2007, at the Loo Palace in Apeldoorn, The Netherlands. Felipe is heir to the Spanish throne.

Princess Cristina and Inaki Urdangarin of Spain arrive at Loo Palace in Apeldoorn to attend the party marking the 40th birthday of Crown Prince Willem-Alexander of the Netherlands. Creistina is the daughter of King Juan Carlos of Spain.

Prince Edward, Earl of Wessex, and Sophie Rhys-Jones, Countess of Wessex, arrive to attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at the Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. Prince Edward is the youngest son of Britain's Queen Elizabeth II. The countess is expecting their second child.

Prince Pieter Christiaan of The Netherlands and Princess Anita of The Netherlands arrive at the celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at the Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. He is a nephew of Queen Beatrix.

Prince Maurits of the Netherlands and his wife, Princess Marilene, arrive at the celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at the Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. He is a nephew of Queen Beatrix.

Dutch Prince Constantijn and his wife, Princess Laurentien, arrive to attend celebrations marking the 40th birthday of the prince's older brother, Dutch Crown Prince Willem Alexander, at Loo Palace on Sept. 1, 2007 in Apeldoorn, The Netherlands.

Prince Jaime, Princess Margarita, Princess Carolina and Prince Carlos arrive to attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007 in Apeldoorn, The Netherlands.

Princess Badiya Bint El Hassan of Jordan and her husband, Khaled Edward Blair, arrive to attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007 in Apeldoorn, The Netherlands.

Prince El Hassan Bin Talal and Princess Sarvath El Hassan of Jordan arrive to attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands.

Crown Prince Haakon of Norway is flanked by his wife, Princess Mette Marit, left, and Crown Princess Victoria of Sweden at celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands.

Prince Kardam and Princess Miriam of Tirnovo of Bulgaria arrive at celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. He is eldest son of the deposed tsar Simeon II of Bulgaria.

Crown Prince Philippe of Belgium and his wife, Princess Mathilde, attend celebrations marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. The prince is the heir to the Belgium throne.

Prince Kyril and Princess Rosario of Bulgaria arrive at a party marking the 40th birthday of Dutch Crown Prince Willem Alexander at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands. The prince is the heir to the Belgium throne.

Dutch Princesses Amalia, right, and Alexia Maxima peek at the guests at a 40th birthday party for their father, Dutch Crown Prince Willem Alexander, at Loo Palace on Sept. 1, 2007 in Apeldoorn, The Netherlands. Amalie, who is 3, and Alexis, who is 2, have a baby sister, Ariane, who was born in April.

Dutch Prince Constantijn, Princess Laurentien, left, and Queen Beatrix walk down to fetch 2-year-old Princess Alexia after a group photo marking the 40th birthday of Alexia's father, Dutch Crown Prince Willem Alexander, at Loo Palace on Sept. 1, 2007, in Apeldoorn, The Netherlands.