Surprise! Crown Princess Mette-Marit introduces her 'grandchild'
The Norwegian royal's son Marius Borg Høiby visited her with his pup
Crown Princess Mette-Marit and Crown Prince Haakon support Marius' relationship with the former Playboy model.
Marius quit his public life in 2017.
Crown Princess Mette-Marit is also a mother to 15-year-old daughter Princess Ingrid Alexandra and 13-year-old son Prince Sverre Magnus, whom she shares with husband Crown Prince Haakon.