"No phone no cares, I was dumb and so young".
The collaboration sees the two reminiscing on the turn of the millennium – with references to Britney Spears and Slim Shady being littered throughout.
1999, a song by Charli XCX, Troye Sivan on Spotify
“Yeah, I remember back home Best friends, all night, no phone no cares, I was dumb and so young”, the pair sing on the track.
The pair previously teased the collaboration as they shared the single artwork – which appears to take strong influence from the Matrix.
Describing working with Sivan, Charli wrote on Twitter: “JUST WANNA TAKE A SEC 2 SAY HOW HAPPY I AM TO BE DOING A SONG WITH @TROYESIVAN. TROYE IS HONESTLY 1 OF MY FAV ARTISTS & I THINK WHAT HE’S DOING FOR POP MUSIC IS INCREDIBLE & SPECIAL & EXCITING. I FUCKING STANNN! LUV U TROYE! 1999 DROPS MIDNIGHT TONIGHT! PS SORRY 4 YELLING.”
The new track follows the release of Sivan’s second album, ‘Bloom’, in August. Read NME’s five-star review.