Dutch Princess Ariane (C) on her first school day at the Bloemcampschool in Wassenaar April 11, 2011.

Dutch Prince Willem-Alexander (TOp C) and Princess Maxima (3R), Princess Alexia (L), Princess Amalia (3L), teacher Carla Buijs (2R) and teacher Yvonne van Veen (R) accompany Dutch Princess Ariane (C) on her first school day at the Bloemcampschool in Wassenaar April 11, 2011.

Princess Ariane's Christening, October 20, 2007

19-02-2011 Lech Prince Willem-Alexander, Princess Maxima, Princess Amalia, Princess Alexia pose for photographers during a photo session in the Austrian skiing resort of Lech.

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19-12-2010 Argentina Princess Maxima and Prince Willem-Alexander with Princess Amalia (7) and Princess Alexia (5) and Princess Ariane (3) pose for the media at Villa La Angostura, near Bariloche, in Argentina.

Prince Willem-Alexander, Princess Máxima and their three daughters attended the last day of the World Championships in Rotterdam today.

Princess Maxima and Prince Willem-Alexander with Princess Amalia and Princess Alexia and Princess Ariane at the 50th fruit parade in Tiel. 11/9/10

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Queen Beatrix with Princess Amalia and Princess Ariane visited the Breda Hippique at the Prinsenhoeve estate in Breda.

04-09-2010 Breda

Prince Willem-Alexander,Princess Máxima & kids at Sail Amsterdam, August 21, 2010

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Dutch Photo Session at Wassenaar; July 5th, 2010

Photos: Rex