The 25-year-old singer recruited many famous friends to appear in her "Bad Blood" music video, but several of her friends instead strutted the stage during a live performance of "Style" in London on June 27.
In video footage from the show, the ladies can be seen having fun making their way down the catwalk as Swift sings, and Delevingne even marches down the stage with the UK flag.
"Style," which peaked at number 6 on the Hot 100, was released as the third single from Swift's album "1989."