The happy family were out in force at Holmenkollen, a Norwegian neighbourhood famous for its ski jumping hill, Holmenkollbakken, and showed their support as German-born Severin Freund was victorious ahead of Norwegian native Anders Bardal in the ski jump.
Several candid snaps of the group showed them relaxed and smiling throughout the day.
Princess Ingrid charms Queen Sonja
Marius, who is Princess Mette-Marit's son from a previous relationship, was seen sharing a joke with King Harald, while Ingrid, who is Norway's future queen, charmed her grandmother.
Princess Mette-Marit's appearance at the sporting event came the day after she showed her support for International Women's Day.
The Crown Princess supporting International Women's Day
The 40-year-old mother-of-three gave a rousing speech at Constitution hall in Eidsvoll, arguing that it is in a country's best economic interests to recognise the value in all of its working population.