Charli XCX and Troye Sivan bring out Lorde and Addison Rae at Madison Square Garden in New York City. The surprise guests joined Charli and Troye on stage at their co-headlining ‘Sweat’ tour. Lorde performed her ‘Girl, so confusing’ remix alongside Charli for the first time, as Addison sang the live debut of her single, ‘Diet Pepsi.’