Mathilde & Philippe were among the guests at a private celebration for king Willem-Alexander's 50th birthday.
In the afternoon they were at the beach, despite the windy weather, for sports and games.
prince Pieter-Christiaan of the Netherlands & his wife Anita
Grand duchess Maria Teresa & princess Stéphanie of Luxembourg
Grand duke Henri of Luxembourg & behind him: crown princess Victoria of Sweden
Princess Christina's son, Bernardo Guillermo
princess Mabel of the Netherlands
On Sunday the royal guests gathered at Villa Eikenhorst in Wassenaar for a brunch.