Justin Bieber made a surprise appearance Wednesday night and brought the house down at Miami hotspot, LIV Nightclub. 

He spent most of the night up onstage, dancing and singing to his songs -- and you gotta see the highlight of the night. Full light show, screaming fans, and confetti cannons for "Sorry."

Bieber's on fire right now -- dude's got 3 songs in the top 7. Fans love him and he loves 'em back ... but PLEASE "don't touch" the Yeezys, folks.