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LONDON, ENGLAND - JUNE 27: Martha Hunt, Kendall Jenner, Serena Williams, Taylor Swift, Karlie Kloss, Gigi Hadid and Cara Delevingne perform onstage during The 1989 World Tour at Hyde Park on June 27, 2015 in London, England. (Photo by Dave Hogan/TAS/Getty Images for TAS)

LONDON, ENGLAND - JUNE 27:  Martha Hunt, Kendall Jenner, Serena Williams, Taylor Swift, Karlie Kloss, Gigi Hadid and Cara Delevingne perform onstage during The 1989 World Tour at Hyde Park on June 27, 2015 in London, England.   (Photo by Dave Hogan/TAS/Getty Images for TAS)