http://gpdhome.typepad.com/nieuwsberichten/2009/01/constantijn-fotografeert-zijn-drie-kinderen.html (http://gpdhome.typepad.com/nieuwsberichten/2009/01/constantijn-fotografeert-zijn-drie-kinderen.html) Dutch article with pictures
Summary:
Prince Constatijn released four pictures of his children, which he made himself in august.
His children are daughter Eloise, son Claus-Casimir and the youngest daughter Leonore.