The emerging singer walked away with three accolades at last night's ceremony in Canada - including Video of the Year for her breakout hit Call Me Maybe.
Carly also scooped the fan-voted UR Fave Video of the Year and Most Watched Video of the Year.
Justin - who was also honoured at the event - has always supported his fellow Canadian artist, and took to his Twitter page to gush about her recent success.
"IM VERY PROUD OF @CARLYRAEJEPSEN 2nite! SHE WAS A SUPERSTAR!! PROUD OF YOU! CANADA STAND UP! (sic)," he exclaimed on his Twitter page.
Justin, who picked up the trophy for International Video of the Year by a Canadian, walked the red carpet with his two-year-old half-brother, Jaxon. The 18-year-old heartthrob loved proudly parading his sibling at the event.
"GREAT NIGHT here in CANADA!! Glad to be home. Got to rock the carpet with my lil bro JAXO! He killed it," he quipped, before adding: "and then U the Fans showed me so much love! Thank you. These awards were ours tonight. love u and happy to rep u! (sic)"
Katy Perry, LMFAO and Nelly Furtado all performed at the music awards ceremony, which was held in Toronto.
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? email@example.com
Be honest about your shortcomings. The sooner you ask for help, the easier it will be to overcome an obstacle. You may require basic training, a hands on tutorial or an official certificate. Admitting your ignorance will make others admire you. Anyone can profess expertise. It takes someone with real courage to expose their vulnerability. The skills you acquire will enhance your earning potential. Anyone who pokes fun at your lack of knowledge is projecting their own insecurities onto you.More