Justin Bieber had a busy and productive year in 2012, so it was fitting that he capped it off by performing on 'Dick Clark's New Year's Rockin' Eve' to ring in 2013 from Los Angeles. He closed the chapter on 2012 with a Bieber bang. But not Bieber bangs, since his hair was spiked!

Dressed in all black with a hooded leather vest and red kicks, the Biebs demonstrated that he sure knows how to lead a party, swag, swag, swag style. He wished fans a "Happy New Year" multiple times, and seemed genuinely happy to be working on a holiday.

He ripped through 'As Long as You Love Me' with a bouncy assist from Big Sean. The familiar choreography from his past performances of the song was also featured in this performance. So it was a reminder of the Biebs in 2012. He also gave Big Sean a bro hug after they performed.

He also delivered a sexy performance of 'Beauty and a Beat.' Nicki Minaj didn't make a cameo; her vocal part was cut.

The teen slowed things down for an acoustic rendition of 'Boyfriend.' Accompanied only by a guitarist, he sat on a stool, added some improvised lyrics and delivered a soulful and "new" version of his 2012 hit. It was stripped down, devoid of lights and production, favoring his voice.

We hope to see more of "this" Biebs in 2013.

Happy New Year, Beliebers and PopCrushers!

Watch Justin Bieber Perform 'As Long as You Love Me'

Watch Justin Bieber Perform 'Boyfriend'