July 19, 2014 - 14:10 BST hellomagazine.com Prince Haakon of Norway poses with wife Mette-Marit and his children ahead of his 41st birthday Prince Haakon of Norway has released several family snaps to mark his 41st birthday which takes place on Sunday. In the official pictures, Haakon is accompanied by wife Princess Mette-Marit and their two children, Princess Ingrid Alexandra, ten, and Prince Sverre Magnus, 8. Prince Haakon celebrates his 41st birthday on Sunday Young Marius Borg Hoiby, Princess Mette-Marit's teenage son from a previous relationship, also appears in the pictures which were taken in Kristiansand, in Southern Norway. The Norwegian royal family, who are dressed in matching neutral hues, can be seen perched on rocks overlooking the sea. To mark the special occasion the prince has released several family snaps Last year, Prince Haakon celebrated his 40th birthday with a festival themed party. He kicked off the celebrations by arriving at Skaugum Palace by parachute. Haakon's wife Princess Mette-Marit had organised the party to perfection, ensuring that the couple's blue-blooded friends, King Willem-Alexander and Queen Maxima of the Netherlands and Princess Mary of Denmark, were present. The pictures were taken in Kristiansand Live music, including a performance from the birthday prince himself, was the event's highlight and when the royal took to the stage with his sister, Princess Märtha Louise, he thanked the host of artists and performers that made the occasion so special.