Bieber and a few friends rolled up unannounced at Chatsworth Charter High School's prom Saturday night.
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According to the school, his entourage pushed past the school's security to gain access to the dance floor.
It took a few seconds for the teens to realize the pop star was dancing among them. When they did, the crowd went wild!
The 21-year-old singer was only there for three or four minutes, but students immediately took to social media, calling it the best prom ever.