Belgian Royal children attend religious festival at Laeken . Following their coronation of the statue of Our Lady of Laaken near the Royal Palace of Laeken , Crown Prince Baudoin and Princess Josephine Charlotte , children of the King of the Belgians , watched a religious procession , ' The Mystic Rose ' , pass before the dais on which they sat with Church dignitaries . The traditional ceremony was the first function King Leopold and his children had attended together in public since the tragic death of Queen Astrid . Photo shows , Crown Prince Baudoin and Princess Josephine Charlotte waving as the religious procession passed . 19 May 1936