Watch Taylor Swift, Charli XCX Team for 'Boom Clap' in Toronto

On the same night that Saturday Night Live poked fun at Taylor Swift’s ever-expanding “squad,” the singer welcomed another artist into her crew as Charli XCX joined Swift onstage at Toronto’s Rogers Centre to perform her breakout hit “Boom Clap.” The two singers traded verses on the Sucker single as pyrotechnics…