The littlest shepherdess: Princess Estelle plays with sheep and cuddles her baby brother Oscar in super-cute photos released for Sweden's National Day 

They marked their country's National Day by attending official celebrations in Stockholm.

But Sweden's royal family have also marked the special day by releasing a new set of portraits of their adorable children, Princess Estelle, four, and Oscar, three months.

Proud parents Crown Princess Victoria and her husband Prince Daniel, who welcomed their youngest child in March, released the photographs via the official royal website.

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Family time: Crown Princess Victoria and Prince Daniel have released this brand new set of portraits of their adorable children, Princess Estelle, four (right) and Oscar, three months (left) to mark Sweden's National Day

Princess Estelle, who is second in line to the throne, wears traditional Swedish colours of blue and yellow while cradling her younger brother Oscar, who was born in March. The photographs were taken at Haga Palace

Taken in the grounds of their home at Haga Palace, Stockholm, the informal photographs show Victoria, 38, who is heir to the Swedish throne, laughing and playing with her two adorable children.

Victoria wears a broad-rimmed hat with a billowing white dress, while her mini-me daughter sports an adorable matching straw hat.

Estelle, who is second in line to the throne, is dressed in a pale blue striped summer dress with capped sleeves, while her younger brother wears a blue romper. It is the young prince's first official portrait.

In one picture, the proud mother cradles Oscar on her knee while sharing a joke with Estelle; while another sees the young princess in traditional Swedish dress while cuddling up to her brother. 

Estelle runs around the palace gardens while patting a sheep gently on its back. The family have also released an adorable close-up of Oscar (below) who bears a striking resemblance to his mother Princess Victoria

Oscar, who was born in March, wears a pale blue romper suit in his very first official portrait. The children were absent from Sweden's National Day celebrations in Stockholm earlier today, which their parents attended

In a third image, Estelle runs around the palace gardens while patting a sheep gently on its back. The family have also released an adorable close-up of Oscar, who bears a striking resemblance to his mother.

Earlier today, Victoria looked wonderfully summery in a colourful floral dress and pink cardigan at the official celebrations in Stockholm.

She was joined by Prince Daniel, but the couple's two children remained at home. The couple looked happy and relaxed as they attended a citizenship ceremony at Nacka City Hall.

Victoria's young nephew, Prince Alexander of Sweden, also made his public debut today. The seven-week-old Prince attended national celebrations with his mother Princess Sofia, 31, and father Prince Carl Philip in Stockholm. 

Prince Alexander of Sweden made his public debut with his mother Princess Sofia and father Prince Carl Philip at celebrations for Sweden's National Day in Stockholm

The little Prince, who was dressed in a white outfit and wrapped in a grey blanket was as good as gold while his proud parents posed for photos.  

It is the first public engagement Prince Alexander has attended since he was born in April. 

In keeping with the National Day, Princess Sofia dressed in traditional Swedish clothing. She wore a brightly coloured folk outfit; a blue dress over a white collared shirt, with a mustard-coloured apron. The outfit is embroidered with flowers and worn with white tights and low heels.

Meanwhile, Prince Carl Philip, 37, looked dapper in a grey suit and blue tie. 

Later today, the royals are expected to attend a music concert in Sweden's honour at Stockholm's outdoor museum, Skansen. 

Doting new mother Princess Sofia checks that her little one is comfortable 

Princess Sofia wore the traditonal dress of a brightly coloured folk outfit: a blue dress over a white collared shirt, with a mustard-coloured apron

Crown Princess Victoria looked wonderfully summery in a colourful floral dress and baby pink cardigan

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It's been a busy time for the Swedish Royal Family recently. Only last week they were celebrating little Prince Oscar's christening and now it's National Day.

Crown Princess Victoria looked blooming beautiful for the occasion, teaming a floral print dress by Oscar de la Renta with a pair of nude heels by Christian Dior. Add in a woven clutch bag by Abro, a chic up do and jewelry by Kreuger and it's a very ladylike look.

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The Princess was in great spirits as she enjoyed celebrations for the Sweden's National Day

Victoria strolled arm in arm with her husband Prince Daniel but there was no sign of the couple's two children

New mother Victoria looked in great shape just four months after giving birth to her second child

Swedes celebrate their National Day on 6 June in honour of two historical events: on 6 June 1523, Gustav Vasa was elected king and, on the same date in 1809, the country adopted a new constitution. It became a public holiday in 2004.

Every year the King and Queen take part in a ceremony at Skansen, Stockholm’s open-air museum, where the yellow and blue Swedish flag is run up the mast, and children in traditional peasant costume present the royals with bouquets of summer flowers.

National Day also now recognises new Swedish citizens, welcoming them with special ceremonies held around the country.

The royal couped attend a citizenship ceremony on Sweden's National Day at Nacka City Hall

Prince Daniel looked smart in a dark blue suit as the couple strolled arm in arm 

The happy couple looked relaxed and affectionate with each other 

Princess Victoria was presented with flowers by well-wishers on Sweden's National Day 

Not normally known for being the most patriotic nation, National Day has been embraced over recent years, with some groups even pushing for the country to have a national dish, according to the country’s official website.

Prince Alexander Erik Hubertus Bertil, who was born on April 19 at Danderyds Hospital in Stockholm weighing at 7lbs 9oz. and measuring 19.3 inches long.

Hours after the birth, Carl Philip held a press conference at the hospital to announce the new arrival.

'When asked if he had cried during the birth, the prince replied, according to People magazine: 'Yes, actually. Of course. Couldn't stop.

'For me and my wife, this is obviously a great day with a lot of emotion. Words cannot describe.' 

The royals looked delighted to show off their new son to the world for the first time 

The couple greeted well wishers at celebrations in Stockholm 

New mother Princess Sofia looked glowing as she attended National Day celebrations