VIDEO : 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. 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 fireworks exploded during the chorus, turning the former Sky Dome into a giant sing-along. The "Boom Clap" performance came a night after Swift brought out Keith Urban to duet on the country singer's latest chart-topper "John Cougar, John Deere, John 3:16" as well as his 2002 hit "Somebody Like You."