Bieber fans 'get angry' over criticism

Last updated at 13:19
To enjoy the CBBC Newsround website at its best you will need to have JavaScript turned on.
Justin talks about his album, fans and films

Justin Bieber says it's "crazy" how angry his fans get when other celebrities criticise him.

He told BBC Breakfast he now wants to appeal to an older audience, as well as starring in movies.

The teen star is currently writing a film about basketball with Hollywood star Mark Wahlberg.

He's also hoping to win a Grammy award for his new album. It includes a new track he's been working on with The Voice coach will.i.am.