The royal appeared in high spirits as she posed for the cameras at Domaine Royal de Laeken Koninklijk Domein van Laken in Brussels - the official residence of the Belgian royal family.
European royalty is entering uncharted waters - the more so as widespread legal changes mean that in the majority of countries, girls are now entitled to inherit the crown.
The queen, who will be celebrating her 51st birthday in three days, descended on the prestigious financial event in Davos dressed in an elegant wine-coloured two piece set
The royal, 22, posed for pictures with King Philippe, 63, Queen Mathilde, 50, Prince Emmanuel, 18 and Princess Eleonore, 15, as the family enjoyed a reception at the Royal Palace in Brussels.