After bringing his adorable little brother to the red carpet, the 21-year-old singer stepped into the spotlight during music's biggest night and wowed the crowd with a two-part performance -- complete with a bizarre guitar toss.
Bieber kicked off his set with an acoustic rendition of his hit single "Love Yourself." Wearing a backwards black baseball cap and a cheetah-print jacket, the slowed-down song sounded almost unrecognizable (in a good way!) as he crooned to the audience.
Before moving onto his next song, the Biebs belted out the final note of his catchy ballad and then ditched his guitar by slamming it to the ground.