Last night, Jack Ü, the team of Diplo and Skrillex, headlined L.A.’s dance-centric HARD Summer Fest, and they brought friends with them. The night’s big guest was Justin Bieber, currently rehabbing a broken career with the help of his (honestly really great) Jack Ü collab “Where Are Ü Now,” one of the surprise hits of the summer. Bieber, in a Metallica shirt, brought a whole team of dancers to help him out on the song, and from all available evidence, the crowd went bugshit for him. And also during Jack Ü’s set, AlunaGeorge singer Aluna Francis joined the group to sing two songs: The massive DJ Snake version of AlunaGeorge’s “You Know You Like It” and “To Ü,” the track she sings on Jack Ü’s surprise album Skrillex And Diplo Present Jack Ü. Watch fan-made footage of both guests below.

Skrillex And Diplo Present Jack Ü is out now on Atlantic.