On Tuesday, Sept. 24, Charli xcx brought out Lorde as a surprise guest during the Sweat Tour show at Madison Square Garden in New York City. Addison Rae also made a cameo to perform her single "Diet Pepsi" with Charli and Troye Sivan.
https://people.com/charli-xcx-brings-out-lorde-surprise-guest-during-ny…