Since then, the pair have shared the frankly amazing video for the track. Jam-packed with cultural references from the ’90s, the new video - which was co-produced by Charli alongside Ryan Staake - saw the pair dress up as from Jack and Rose in Titanic, the Spice Girls, Steve Jobs, the Backstreet Boys, the Sims and loads more.
After performing it together at Troye’s recent Radio City Music Hall show, the pair brought ‘1999’ to the telly last night, playing the song on Fallon.
Flanked by green lasers, the performance is energetic, intense and very, very fun. Watch it below.
Read ‘It’s Charli, Baby’ - our comprehensive guide to Charli XCX - here.
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