Justin Bieber has given director Lee Hirsch's controversial new movie Bully a big box office boost by donating a new song for the film's trailer.
The singer was among the celebrities petitioning for officials at the Motion Picture Association of America to drop Bully's R rating so more teenagers could see the hard-hitting film.
The teenage pop sensation says, "My fans are always for supporting a great cause. It's one of the things I'm most proud of as an entertainer. I hope they see Bully with their friends and help start the conversation so we can end bullying."
The TV ad featuring Justin Bieber's song premiered on Fandango.com on Monday (09Apr12).
