Justin Bieber has explained why he cried at the MTV VMAs on Sunday.

Things got emotional at the awards show when the 21-year-old broke down in tears at the end of his performance. Now the star has opened up about the moment, explaining why it all became too much at the Microsoft Theater in Los Angeles.

"It was so overwhelming for me, everything… I missed some cues so I was a little disappointed at that,” he told talk show host Jimmy Fallon. “Honestly, I just wasn’t expecting them to support me in the way they did. Last time I was at an awards show, I was booed.”

Justin was presented with the Milestone Award at the Billboards in 2013 but was heckled by the crowd when he went up to collect his prize.

He hardly has a squeaky-clean past, with several run-ins with the law, but now Justin has turned his life around and is focusing on his career and making his fans proud.

“I think it’s just like I’ve worked so hard at this album and at becoming the man I want to become, and then stepping into situations, you just can’t help but feel judged," he continued.

"So I was just feeling judged and wanting to win so badly, and wanting to do what I love so badly that I just put everything on the line. And I think that that was what was so special about the emotional moment at the end, that it was authentic. It was real. I was really just wanting it so bad.”

Justin's song with Skrillex and Diplo, Where Are Ü Now, picked up the best visual effects award at the show on Sunday.

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