Justin Bieber appeared (along with Diplo, Kiesza, and P. Diddy) during Skrillex's set last night to close out Miami's Ultra Music Festival this past weekend.

Bieber came out for "Where are U Now" – his hit single with Skrillex + Diplo, in collaboration JackU. He danced around on the stage for a while by himself to pump up the crowd before he was joined by the other A-list artists. Reception was mixed on social media last evening, but there's no denying his star power and the supergroup's appeal.

What do you think? Worthy end to the weekend? Let our video help you decide.