Princess EstelleandPrince Oscarlook the part for Sweden’s Nationaldagen (National Day)!

New photos of the little royals, whose parents areCrown Princess Victoriaand Prince Daniel,decked outin traditional garb were released on Thursday for the Swedish holiday, and they couldn’t be cuter.

Meanwhile, 3-year-old Oscar donned a simple yet classic button down shirt and dark blue shorts.

The siblings smile as they pose with flowers, then hold hands during an outdoor stroll (with Oscar adorably looking up to his big sister). They also work together to collect wild flowers in their pails.

Princess Estelle and Prince Oscar.Linda Broström/The Royal Court of Sweden

Princess Estelle and Prince Oscar

Prince Oscar and Princess Estelle.Linda Broström/The Royal Court of Sweden

Princess Estelle and Prince Oscar

Princess Estelle and Prince Oscar

Their aunt Princess Sofia also got in the spirit, donning the traditional dress at a ceremony celebrating Sweden’s national day at the Royal Palace in Stockholm. Her husband, Prince Carl Philip, looked handsome in a navy suit paired with a blue tie.

Prince Carl Philip and Princess Sofia.Michael Campanella/Getty

Prince Carl Phillip of Sweden and Princess Sofia of Sweden

Queen Silvia and King Carl XVI Gustaf.Kungahuset/Swedish Royal Court

Sweden’s Queen Silvia and King Carl XVI Gustaf

Sweden began officially celebrating the holiday on June 6 in 1983 tocommemoratethe day Gustav Vasa was crowned king in 1523, as well as the day a new constitution was adopted in 1809. Arthur Hazelius, the founder of Skansen, Stockholm’s open-air museum, first suggested the idea for national day and started celebrating there as early as the 1890s.

source: people.com