They're also heading out on tour next month...
Despite not being scheduled to perform at the Chicago festival, Halsey was brought on stage halfway through the set to perform the iconic hit. You can watch footage of their collaboration below.
The footage comes ahead of their joint tour next month, with Charli XCX supporting Halsey as she heads out for shows across North America.
Charli also opened up on the recording of her new album during the Lollapalooza set and confirmed that recent single ‘Boys’ will appear on the record.
The post Watch Charli XCX team up with Halsey to cover Spice Girls at Lollapalooza appeared first on NME.