LONDON — Little did Swifties know Taylor Swift was going to bring Florence Welch on stage for a surprise duet of "Florida!!!" at the final night of the European Eras Tour.

Florence Welch joined Taylor Swift for the latter’s final concert in London on Tuesday to deliver the debut performance of their collaborative “Florida!!!” British fans were also treated to a surprise appearance from Jack Antonoff for “Death By a Thousand Cuts” and “Getaway Car,

For The Tortured Poets Department hit, "Florida!!!," Swift surprised fans with her collaborator, Florence Welch of Florence + The Machine.