Princess Estelle and Prince Oscar of Sweden star in adorable National Day greeting

Princess Estelle and her baby brother Prince Oscar star in a new adorable set of portraits marking Sweden's National Day. The duo's too-cute greeting was released on Monday (June 6) to coincide with the Scandinavian country's national celebration.

One photo showed Estelle playing the doting big sister and wrapping her arms around her baby brother. The young Princess flashed a huge smile at the camera as she cradled Oscar, who was born on 2 March, and gently rested her head on his.

The photoshoot took place in the grounds of the family's home Haga Palace.

TAP TO VIEW GALLERYPortrait of Princess Estelle holding baby brother Prince Oscar Baby Prince Oscar was born in early March

In keeping with tradition, Estelle, four, was dressed in her blue and yellow national day dress – attire that the female royals all don for the celebration.

Another picture showed the princess running around the palace gardens, playing with sheep and gently patting one on its back.

ROYAL CHILDREN: GALLERY OF THE CUTEST YOUNGSTERS Princess Estelle with sheep Princess Estelle, four, wore her traditional dress for Sweden's national day

The youngster's mum Crown Princess Victoria also featured in another gorgeous shot that was taken some time before the national day. Dressed in normal clothes, Victoria, 38, matched her daughter Estelle in a summery sun hat.

Sweden's future queen bounced baby Oscar on her lap while she and Estelle giggled at each other.

Mother Princess Victoria holds her Prince Oscar while smiling with daughter Princess Estelle The siblings pictured with their mum Crown Princess Victoria

Each year the nation celebrates national day on 6 June. Members of the royal family lead the festivities, which begin in the morning with the opening of the palace gates. The public are then invited to tour the royal residence.

This year the honour fell to Prince Carl Philip and Princess Sofia, who have just welcomed their first child in April. The couple greeted royal watchers outside the palace and waved to crowds, with Sofia, 31, proudly showing off her son Alexander.

This was the newborn prince's first official debut and went down a treat with fans, who were no doubt thrilled to catch a glimpse of the royal bundle of joy.

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