Crown Princess Mette-Marit of Norway dons royally red trousers as she visits a Viking museum to lay a foundation stone

Crown Princess Mette-Marit, 50, looked chic in a navy blazer and red trousers  READ MORE: King Harald of Norway, 87, puts recent health woes behind him for a touching family portrait weeks after having a pacemaker fitted

Crown Princess Mette-Marit of Norway brought a touch of glamour to an Oslo building site on Tuesday as she prepared to lay the foundation stone for the new Museum of the Viking Age.

The Norwegian royal, 50, appeared happy to be involved in the very first stages of the building project, which is due to conclude in 2027.

Mette-Marit, who is the wife of Crown Prince Haakon, the 50-year-old heir to the throne, looked chic in a navy blazer and a pair of red wide-leg trousers.

The mother-of-three wore a white blouse with a gathered neckline underneath her jacket, which she had accessorised with a large, gold brooch.

Carrying a bouquet of white and green flowers, which she had been gifted by a local girl, Mette-Marit completed her stylish ensemble with a pair of nude ballet flats and an elaborate gold clutch bag.

Crown Princess Mette-Marit (centre) was joined by political and cultural figures as she prepared to lay the foundation stone for the new Museum of the Viking Age

Crown Princess Mette-Marit (centre) was joined by political and cultural figures as she prepared to lay the foundation stone for the new Museum of the Viking Age

The Crown Princess wore her blond hair in loose curls for the occasion and kept her make-up simple, with only mascara and a slick of nude lipstick.

Joined by a number of political and cultural figures, including the director of the Museum of Cultural History, Harald Nikolaisen, the Minister of Research and Higher Education, Oddmund Hoel, and the Mayor of Oslo, Anne Lindboe, a smiling Mette-Marit couldn't disguise her enthusiasm for the upcoming museum.

Crown Princess Mette-Marit's appearance on Tuesday comes just two weeks after Norway's National Day when she and her husband were joined by their daughter, Princess Ingrid Alexandra, on the royal balcony.

Princess Ingrid Alexandra, the granddaughter of King Harald V, 87, looked smart in her miliarty uniform as she waved from the balcony at their Skaugum estate in Oslo during Norwegian Constitution Day.

Ingrid Alexandra, 20, who started her military training in January, is set to serve a year at the Engineer Battalion in Brigade Nord and will go to Skjold camp in Indre Troms.

However it appears the princess took some time out of training to join her parents and their dog Molly to celebrate their national day as they waved at the children's parade.

Earlier in the day, the princess donned an elaborate Norwegian traditional black gown with a white blouse.

Her brunette locks were styled in a straight centre parting, while her neutral makeup enhanced her naturally pretty features.

The Norwegian royal, 50, paired a smart navy blazer with red wide-leg trousers, achieving a look that's both casual and chic

The Norwegian royal, 50, paired a smart navy blazer with red wide-leg trousers, achieving a look that's both casual and chic

The Crown Princess is pictured with Harald V. Nikolaisen, the managing director of Statsbygg, the company behind government building projects

The Crown Princess is pictured with Harald V. Nikolaisen, the managing director of Statsbygg, the company behind government building projects

The mother-of-three wore her blond hair in loose curls and kept her make-up simple for the occasion

The mother-of-three wore her blond hair in loose curls and kept her make-up simple for the occasion

Princess Mette-Marit wowed in a traditional red and white ensemble as she waved a Norwegian flag from the steps of her residence.

Prince Haakon opted to wear a man's bunad suit; traditional Norwegian costumes featuring knee socks and white shirts, as well as pops of red - which features prominently on the country's flag.

They were also accompanied by their pet pooch Molly, whose neck was adorned with neckerchiefs in the red and blue colours of Norway. However their son Sverre Magnus, 18, was not seen during the celebrations.

The holiday, which is celebrated on May 17th every year, marks the signing of the constitution declaring Norway an independent kingdom in 1814.

The constitution declared Norway to be an independent kingdom in an attempt to avoid being ceded to Sweden after Denmark–Norway's devastating defeat in the Napoleonic Wars.

Celebrations, which take place nationwide, include parades as well as the royal appearances where the family greet crowds of the public.

Mette-Marit shook hands with the Mayor of Oslo, Anne Lindboe (centre) and received a bouquet of flowers

Mette-Marit shook hands with the Mayor of Oslo, Anne Lindboe (centre) and received a bouquet of flowers

The Crown Princess completed her look with an elaborate gold clutch bag, which she carried along with the bouquet of white and green flowers

The Crown Princess completed her look with an elaborate gold clutch bag, which she carried along with the bouquet of white and green flowers

She wore a white blouse with a gathered neckline underneath her navy blazer

She wore a white blouse with a gathered neckline underneath her navy blazer

Crown Princess Mette-Marit heard about the plans for the new Museum of the Viking Age from cultural and political figures

Crown Princess Mette-Marit heard about the plans for the new Museum of the Viking Age from cultural and political figures

Earlier this year, King Harald, Europe's oldest monarch, underwent a pacemaker implant procedure at Oslo's University Hospital after falling ill during a private holiday in Malaysia.

The King returned to public duties in time for Easter week.

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