Troye Sivan also joined the pair for a performance of "TiK ToK” Charli xcx ... Kesha for a performance of her 2009 classic "TiK ToK." That wasn't the only unexpected guest at the concert.

Last week, Lorde, Billie Eilish and Troye Sivan surprised audiences at the Coachella Valley Music and Arts Festival during Charli XCX's Saturday ... he brought out Kesha to sing her bop "YIPPEE ...

From the LED-lit altar of the Moody Center to the sweaty, neon-drenched afterparty at Barbarella's, Charli XCX's Austin takeover was less a concert, more a carefully orchestrated mass communion ...

Nothing major has truly changed about the nature of Charli XCX's live show over the past ... though she did bring out Kesha for the freshly unwrapped version of "Spring Breakers" and a run-through ...

Stay with us to see who showed up. A.G. Cook, best known as Charli XCX's producer, has really made a name for himself these last two weekends of Coachella. Last weekend he brought out Danny Brown, a ...