Charli xcx brought out Billie Eilish, Lorde and Troye Sivan for her raucous Coachella set... and commented on the future of 'Brat Summer.'

The hip Coachella crowd sang right along with ‘em. Yo Gabba Gabba’s set closed with another crowded stage of guests to sing “The Rainbow Connection,” including Paul Williams, who wrote the song, “Weird Al” Yankovic and the indie rock band Portugal. The Man, and other random characters, including H.R. Pufnstuf and Bozo the Clown.

The British singer-songwriter returned to the Coachella Stage Saturday, turning the desert into a full-on rave.