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.
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Expanding your horizons isn't possible right now. There are lots of mundane responsibilities that require your attention. Neglecting these duties will create enemies. People are relying on you to pull your weight. The sooner you tackle your work, the faster you will be able to enjoy some leisure time. Catching up on your reading, playing a sport or watching a movie will help you wind down. There are worse things than being held captive by a regular routine.More