The polished pop-star thing is kind of dead,” says Charli, acknowledging the way in which both her and Halsey’s unfiltered attitude have helped transform the expectations surrounding women in their genre. Tonight, as usual, they’re impossibly cool -- Charli in a leather jacket, her curls gathered into an off-kilter ponytail; Halsey in a black bustier top, her violet pixie cut perfectly tousled -- but also exude the kind of raw personality that Spice Girls-era pop stars arguably could not.