The friendship between Prince William and Kate Middleton and Princess Victoria and Prince Daniel of Sweden truly blossomed during one very important country tour. In early 2018, the Prince and Princess of Wales traveled out of London and went on an official tour of Sweden and Norway. While they were in Sweden, the popular married pair spent a great deal of time hanging out with the Swedish royal family members, including Princess Victoria and Prince Daniel. The royal couples took time to chat and sip tea at Haga Palace, the luxurious residence where the Swedish crown princess and prince live. During their visit to the palace, William and Kate were able to meet their Swedish counterparts' two young children, Princess Estelle and Prince Oscar. The couples most likely swapped some royal parenting tips, as William and Kate's three children — George, Charlotte, and Louis — are all close in age to Estelle and Oscar.

The royals were also spotted visiting the esteemed Nobel Prize Museum and attended various meetings side by side throughout the official visit. Their time in Sweden must have gone well because it wouldn't be the last time the princes and princesses would be seen out and about together.