Crown Princess Victoria interrupted her military training for a special visit to Germany alongside her husband, Prince Daniel, and their European counterparts.
The Swedish royals were joined by Denmark's King Frederik and Queen Mary and Norway's Crown Prince Haakon and Crown Princess Mette-Marit to mark the 25th anniversary of the Nordic countries' joint embassy facility in Berlin on Tuesday.
The three couples attended the ceremony outside the Nordic Embassies in the German capital, where future queen Victoria, 47, delivered a speech.
And in the evening, they all stepped out for an official dinner at the Bellevue presidential palace, with Queen Mary, 52, wowing in a red satin ball gown and Crown Princess Victoria opting for a purple velvet dress.
Norway's future queen consort Crown Princess Mette-Marit, 51, was pretty in a white belted dress with multi-coloured prints.
Her appearance comes just a week after the Norwegian palace had confirmed that the mother-of-three has restarted treatment for pulmonary fibrosis, a chronic lung condition.
The Scandinavian royals share a close and long standing friendship.
Victoria and Haakon are both godparents to Frederik and Mary's eldest child, Crown Prince Christian, while Victoria is also godmother to Haakon and Mette-Marit's daughter, Princess Ingrid Alexandra.
In turn, Mary is godmother to Victoria and Daniel's firstborn, Princess Estelle, while Frederik is one of their son Prince Oscar's godparents.
Meanwhile, Frederik acted as Haakon's best man on his wedding day to Mette-Marit in 2001.
Crown Princess Victoria's military training
The Swedish royal has temporarily stepped back from some of her public duties as she continues her special officer training with the Swedish Armed Forces.
The Crown Princess enrolled as a cadet in August and said in a statement she was "looking forward to an interesting and rewarding study time".
The special officer training will take Victoria around 20 months to complete and will teach her about military strategy and tactics, as well as preparing her for her future role as Queen.