"When You Tell the World You're Mine" is a song recorded by Swedish singers Agnes Carlsson and Björn Skifs. The song was performed at the Wedding of Victoria, Crown Princess of Sweden, and Daniel Westling on June 19, 2010. It was also the official wedding song, written especially for the occasion and as a gift to the bridal couple. Before the ceremony, the title and everything concerning the song was a secret, and it was not until the actual performance that this information was revealed.