Charli XCX and Troye Sivan’s Friendship and Collaboration Timeline

LOS ANGELES, Calif. — Charli XCX and Troye Sivan, two of pop music’s most dynamic artists, have cultivated a friendship and creative partnership that has captivated fans and defined a new era of pop culture. Their bond, which began at a Los Angeles house party, has evolved into a series of successful collaborations and a highly anticipated joint tour.

The duo first met at one of Charli’s infamous house parties, where Sivan, uninvited, “somehow ended up,” as he recounted during an April 2024 appearance on *Late Night With Seth Meyers*. Charli, initially unaware of his presence, admitted to being “quite starstruck” when they crossed paths in her kitchen. Though the exact year of their meeting remains unclear, it likely occurred after 2016, when Charli purchased her Los Angeles home, as reported by *Architectural Digest*.

Their first musical collaboration came in October 2018 with the release of “1999,” a nostalgic pop hit that paid homage to iconic ’90s references. In an interview with *Vice*, Charli revealed that she initially considered keeping the track for herself but decided to collaborate with Sivan after he expressed enthusiasm for the demo. “He did a verse and wrote his middle eight, and then it just… happened,” she said. The accompanying music video, featuring nods to *Titanic*, the Backstreet Boys, and the Spice Girls, became an instant fan favorite.

In 2019, the duo followed up with “2099,” a track that, while not as commercially successful as its predecessor, further solidified their creative synergy. Their partnership reached new heights in 2024 when they announced the Sweat Tour, a joint venture that kicked off in September. The tour, which featured alternating performances of their solo hits and collaborations, became a defining moment in pop culture, with viral moments and celebrity appearances at every stop.

Charli and Sivan extended the tour with a surprise performance at the 2025 Primavera Sound Barcelona festival, capping off what Charli described as an “unforgettable” experience. In a heartfelt Instagram post, she praised Sivan, writing, “Troye was such a massive part of making these shows so fun and exciting and unforgettable. You’re one of a kind, I love you so much, you inspire me constantly.”

Their friendship, marked by authenticity and mutual admiration, stands in contrast to the often transactional nature of celebrity relationships. From their chance meeting to their chart-topping collaborations, Charli XCX and Troye Sivan have proven that their bond is as genuine as it is impactful.