Crown Princess Mary and Crown Prince Frederik of Denmark joined Princess Victoria and Prince Daniel of Sweden at a Swedish-Danish business forum in Copenhagen at the Danish Industry headquarters.
The Scandanavian royals looked chic in their seasonal attire, channelling the very best Autumn fashion.
Princess Mary, 47, looked elegant in a pleated block print skirt, with a black blazer, light blue pumps and a thin leather belt.
WATCH: Princess Mary stuns in a daring pantsuit
The mum-of-four wore her hair down, finishing off her smart look with a pair of dangling blue earrings.
Meanwhile, Princess Victoria of Sweden channelled Autumn elegance a beige dress with a brown leather belt, tying her hair back in a low ponytail.
The royals have been spending an extra amount of time together recently, as the foursome has joined forces for the 2019 Confederation of Danish Industry Summit.
Posting a photo to Instagram on September 18, Princess Mary and Prince Frederik spoke about the exciting new innovations that aim for "a sustainable development strategy" for global companies to work together to tackle the challenges facing the planet.