Never Say Never director Jon M. Chu has claimed that Justin Bieber is a "troublemaker", while insisting that he's also "charming as hell."

Speaking at the premiere of the new 3D film in Los Angeles, Jon told E! News: ''I think if [moviegoers] just see Justin the way I see Justin, they'll accept him - warts and all - and see that he's not as bad as the press makes him out to be sometimes, and he's not as innocent as he tries to paint himself sometimes.

''He's a troublemaker. It's what he is and he's charming as hell, but that's who he is and that's what makes him Justin Bieber.''

The first documentary movie about Bieber, Never Say Never grossed nearly $100 million in 2011.