Justin was "honored" to perform alongside the EDM act.
We pooled together some of the best (and most bizarre) mashups to come out of the past few years.
Justin Bieber has dropped out of two upcoming television appearances, because he needs a break from his whirlwind promo schedule.
Which tune reigns supreme as the ultimate Song Of The Year?
From Marina and the Diamonds to the boys of One Direction, which of this year's releases deserves to be named PopCrush's Album of the Year?
Between a rain-soaked Justin Bieber set and a slow, emotional Carrie Underwood ballad, tell us which performance left you in awe.
The Canadian pop star got wet and wild during his closing set.
Biebs went (squeaky clean) '90s grunge on the AMAs red carpet.
Hmmm, do platonic friends really give random romantic piano serenades to one another?
Justin Bieber and James Corden rap along to Kanye West and do a pretty sick "wave" on the Late Late Show.