Norwegian royals don traditional attire as they unveil new family portrait ahead of Prince Sverre Magnus’ 18th birthday

A new photo of the Norwegian royal family has been released ahead of Prince Sverre Magnus’ 18th birthday.

The youngest child of Crown Prince Haakon and Crown Princess Mette-Marit will mark his adulthood on December 3, when he officially turns 18.

The Norwegian royal family celebrated a little early by posing together for the stunning new portrait, which took place in Oslo, Norway.

Celebrating with the prince was his father and heir to the Norwegian throne, Prince Haakon, along with his wife Princess Mette-Marit, both 50. Both stood next to the prince’s only sibling, Princess Ingrid Alexandra, 19.

Also seen in the glittering snaps is his grandfather and King of Norway, King Harald, 86, along with his wife and the prince’s grandmother, Queen Sonja, also 86.

The royal family celebrated a little early by posing together for the beautiful new portrait, which took place in Oslo, Norway

Meanwhile, Mette-Marit’s mother Marit Tjessem – who recently mourned the loss of her long-time partner Magnar Alfred Fjeldvær – also appeared in the memorial photos.

The beaming prince – who is third in line to the Norwegian throne – appeared cheerful in his traditional attire, which he teamed with a pair of black loafers adorned with a sparkling buckle.

Much of the family wore custom fits, with the exception of King Harald, who wore a smart navy blue suit, complete with a multi-blue striped tie and black leather loafers.

The monarch stood at the center of his family, with both his wife and daughter sitting on either side of him.

The camera captured the family in their happiest circumstances, with the prince even posing for a few photos while on his knees.

The royal family donned traditional garb again in May when they appeared in public to celebrate their country’s National Day.

The Crown Prince and his wife both beamed during the celebration of Norway’s Constitution Day at their Skaugum estate in Oslo.

The royal couple were even accompanied by their dog Molly and their son Sverre Magnus, who waved to the crowd.

The prince was pictured in the most cheerful mood and even posed for a few photos while on his knees.

Prince Sverre Magnus marks his ascension to adulthood on December 3, when he officially turns 18

However, their daughter Ingrid Alexandra was not seen during the festivities.

The Crown Princess wore an elaborate Norwegian traditional navy blue dress with a white blouse and black leather boots.

Prince Haakon chose to wear a men’s suit – traditional Norwegian costume with knee-high socks, white shirts and red accents – which is prominently featured on the country’s flag.

Sverre opted for a sleek navy blue suit which he wore with a purple tie, paired with beautiful black leather shoes.

They were also accompanied by their dog Molly, whose neck was decorated with scarves in the red and blue colors of Norway.

The holiday, celebrated every year on May 17, marks the signing of the constitution that declared Norway an independent kingdom in 1814.

The constitution declared Norway an independent kingdom in an attempt to prevent its ceding to Sweden after the devastating defeat of Denmark and Norway in the Napoleonic Wars.

Celebrations, which take place nationwide, include parades and royal appearances with the family greeting the public.

Norway’s monarchy is one of the longest-lasting in the world. The position of King of Norway has existed continuously since the country’s unification in 872.

And in 1905, after the dissolution of the union with Sweden, Haakon VII, grandfather of the current king, was elected to the throne by popular vote.