Watch Halsey and Charli XCX cover the Spice Girls

Halsey and Charli XCX treated festivalgoers at Lollapalooza to a special rendition of the Spice Girls' hit single, 'Wannabe'.

Charli was performing at the music festival on Sunday when she asked the audience if they loved girl power. 

She then brought out Halsey and the wannabe Spice Girls belted out the 1996 pop classic for the crowd.

Halsey, whose single 'Now Or Never' is currently enjoying some major airplay on the Coca-Cola Top 40 chart, was not scheduled to perform at Lollapalooza, but her appearance was a major hit. 

Charli XCX and Halsey are set to go on tour together next month, and their fans are no doubt in for a few surprises if their Lollapalooza appearance is anything to go by.

"Charli had the bessssstttttt crowd and we gave them a Spice-y taste of tour. Thanks Lolla," Halsey said on Instagram. 

Watch their awesome performance of 'Wannabe' below. 

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