The stars performed the Record of the Year winner, "Uptown Funk."
The 21-year-old pop star also sings 'The Late Late Show' theme song.
While some of the evening's performances were show-stoppers, others just had us reaching for the mute button.
The singer slowed things down and turned it up during his performance.
Justin Bieber celebrated his first GRAMMYs win with some high-energy dance moves!
Justin Bieber showed up to the red carpet with his 6-year-old brother Jaxon in tow.
The 21-year-old singer took home his first GRAMMY on Monday for the track 'Where Are U Now' with Skrillex and Diplo.
Bieber's little bro is so cute!
The 23-year-old brought along her BFF, Taylor Swift, as her red-carpet date!
The 21-year-old popstar took home his first gramophone on Monday.
This is far from the singer's usual, handsome look.
Kourtney celebrated Bieber's first GRAMMY win!
ET has all the details on what songs to expect from the 'Sorry' singer at the Grammys.
ET has the scoop straight from the singer's Friday rehearsal.
