Justin Bieber's giving his fans what they want -- if just for a brief moment ... as he got back on a stage to perform live, joining Tems for her Coachella set.
JB hit the stage with WizKid Sunday night at the California music festival, performing their hit song, "Essence" for the excited crowd. Check it out ... the audience goes totally nuts as Justin appears onstage in a black sweatshirt, cargo pants and a baseball hat.
Justin's cameo was a welcome surprise .