Watch The Rolling Stones Play "Wild Horses" With Florence Welch In London

Florence Welch, the howling, bazooka-voiced star behind Florence + The Machine, has performed with the Rolling Stones once before. In November 2012, she joined them onstage at London's O2 Arena to sing "Gimme Shelter" with Mick Jagger. And last night, she did it again, joining the band during their concert at the London Stadium to…