Bieber was another multiple winner, picking up best pop act and top male singer.
Much of the attention in the run-up to the awards has been on the 17-year-old, who has denied allegations made by a US woman that he fathered her child when he was 16.
Accepting the second of his awards, he said: "There's been a lot of crap talked about me lately, but I've pulled through."
The cherubic pop star had earlier avoided media questioning, declining even to pose on the red carpet with his girlfriend, host Selena Gomez, when they arrived for the awards.
COMMENT RULES: Comments that are judged to be defamatory, abusive or in bad taste are not acceptable and contributors who consistently fall below certain criteria will be permanently blacklisted. The moderator will not enter into debate with individual contributors and the moderator’s decision is final. It is Belfast Telegraph policy to close comments on court cases, tribunals and active legal investigations. We may also close comments on articles which are being targeted for abuse. Problems with commenting? firstname.lastname@example.org
A home improvement project will appeal to your love of problem solving. You'll enjoy finding good materials at a decent price. If you're not sure how to tackle a job, check out an illustrated manual or online guide that will make a seemingly complicated task very easy. Organising a family get together could be in the cards. Start looking for a facility where you can gather together without lots of trouble. This venue doesn't have to be luxurious, just well located.More