Swedish/Norwegian royals
Crown Princess Victoria (R) of Sweden and Crown Princess Mette-Marit of Norway take part in a "Climate Pilgrimage" from Halden in Norway to Stromstad in Sweden, August 22, 2015.REUTERS/Jon Olav Nesvold/NTB Scanpix

Crown Princesses Victoria of Sweden and Mette-Marit of Norway joined forces to highlight the dangers of climate change in a series of stops along the Swedish-Norwegian border. The royal pair shared a busy day walking around the Norwegian town of Halden and attending a church service in Stromstad, Sweden.

According to the Daily Mail Online, the royal pair participated in the events as part of the United Nation's global campaign, the Climate Pilgrimage 2015. The princesses first walked around the border town that unites the two Scandinavian countries. Victoria and Mette-Marit were pictured exchanging a bottle of water on a wooden bridge that connects their nations.

During the walk, the two royals dressed casually, the Daily Mail reported. Victoria work a loose white blouse, khaki trousers, lace-up trainers and a Panama hat. Meanwhile, Mette-Marit dressed in cream shots, white cotton blouse and neon Nike trainers.

The two then attended a church service, but not before changing into slightly more formal wear. Victoria changed into an off-the-shoulder black, red and white dress, while Mette Marit opted for a white and cornflower blue floral dress. The princesses were gifted pink roses when they arrived at church, where they watered a plant as part of their commitment.

The busy day came shortly after the Swedish royal arrived from a vacation in the south of France and rumours that she might be pregnant.

German magazine Bunte published photos of the royal's vacation in which she allegedly appeared pregnant. She did not comment about her reported pregnancy.