Taylor Swift ended her Hyde Park British Summer Time performance with one hell of a finale. In a kind of Bad Blood reunion the Shake It Off hit maker was joined on stage by 6 of her fabulous friends. Her BFF Karlie Kloss, Cara Delevingne, Martha Hunt, Serena Williams, Gigi Hadid and Kendall Jenner. After the gig Taylor took to Instagram to post a picture of the 65,000 strong crowd.