Having teamed up last year for "1999", the duo have revealed that there's another collaboration that is yet to be unveiled.
Teasing the new song on Twitter, Trroye Sivan hinted that a performance could be in the works as both artists are playing the same festival on Thursday (6 June).
Replying to Sivan, Charli XCX wrote, "TRUE.. MAYBE WE SHOULD PERFORM IT FOR THE FIRST TIME ON THURSDAY NIGHT AT #GOWESTFEST AND SLAAAAAYY EVERYONE WITH OUR IMPECCABLE TASTE AND TALENT???!!!!"
Soon after Charli XCX confirmed their performance again, "OK ITS OFFICIAL - PERFORMING A BRAND NEW SONG FEATURING Troye Sivan AT #GOWESTFEST ON THURSDAY IN LA."
Last week Charli XCX debuted new collaboration "Gone" with Christine and the Queens at Primavera Sound in Barcelona.