Denmark's Crown Princess Mary might have wowed in a succession of evening gowns last week but Sunday was all about low-key family time for the Australian-born royal. Mary, 43, treated her three youngest children, Princess Isabella, seven, and twins Princess Josephine and Prince Vincent, four, to a day out at a farm in Kirke Hyllinge, a village in Zealand. Making the most of the sunny weather, the quartet certainly appeared to be having fun, with all four crouching down to pet a tiny Holstein Friesian calf. Scroll down for video . Enjoying the sunshine: Denmark's Crown Princess Mary and her daughters Isabella and Josephine . Despite the potential for getting dirty, Mary was as fashionable as ever and appeared to have taken inspiration from the rural location in her tweed jacket and jeans. The three children, meanwhile, were well-wrapped up in cosy padded jackets and appeared fascinated by the cows grazing in one of the barns, with Prince Vincent even climbing a fence to get a better look. But not everyone fancied a day out at the farm, with Mary left without her husband Crown Prince Frederik, 46, and eldest son Prince Christian, nine, for the outing. The visit, which was part of Denmark's annual Eco Day celebrations, came days after royals from around Europe descended on Copenhagen for Queen Margrethe II's 75th birthday celebrations. Having a cuddle: The family met the calf during a visit to a farm in the village of Kirke Hyllinge . Going green: The moment came during Eco Day, an annual event in Denmark . Now my turn: Mary's youngest son, Prince Vincent, four, approaches the calf for a cuddle . Slow down! Mary holds tight to Prince Vincent after the active four-year-old scaled a fence for a better look . Kicking off with a glitzy gala dinner last Wednesday night, festivities continued with a balcony appearance and parade through the Danish capital the following day. Mary, who wowed in a striking lilac gown embellished with silver beadwork on the first night, was seated beside her mother-in-law during the procession up shopping street Strøget. She also appeared on the balcony of the Amalienborg Palace alongside her husband and children and was there once again for the celebration's climax - a spectacular party at Christiansborg Castle. Although she had stiff competition from the equally glamorous Crown Princess Victoria of Sweden, 37, and Norway's Crown Princess Mette-Marit, 41, the Australian-born royal ensured all eyes were on her courtesy of a shimmering silver gown. Still climbing: Prince Vincent watches the action from his perch half way up a gate . Country skills: The Princess and her children also tried their hand at milking, albeit not on a real cow . No photos! Princess Josephine pulls a face at photographers, watched by her mother . Surrounded: The family inspects the herd of Holstein Friesian dairy cows kept at the farm .
Crown Princess Mary spent Sunday on the farm with her children . Husband Crown Prince Frederik was absent as was Prince Christian, nine . Spent the day out petting calves and inspecting a herd of cows . Event took place in the tiny village of Kirke Hyllinge in Zealand .