Justin Bieber Lends Song To "Bully" Film Promo

MIAMI (CBSMiami) – Teen superstar Justin Bieber is lending his voice to support a new documentary about bullying.

Bieber's song "Born To Be Somebody" is being used in the TV ad campaign for the movie "Bully."

The spot premiered on Fandango Monday, just days before the film is released with a PG-13 rating in cities all over the country on April 13th.

"My fans are always up for supporting a great cause. It's one of the things I'm most proud of as an entertainer," said Bieber. "I hope they see "Bully" with their friends and help start the conversation so we can end bullying."

Click here to watch the complete trailer for the movie "Bully."

The highly publicized documentary, which depicts the often-disastrous results of school bullying, originally received an R rating by the MPAA, which inspired 17-year-old Michigan high school student Katy Butler to start a viral petition that received over 500,000 signatures, including Bieber, Ellen DeGeneres, Johnny Depp and Demi Lovato.  DeGeneres even featured the families from the film on her show.

Other celebrities have also worked to help get the word out about the film.

Meryl Streep and attorneys David Boies and Ted Olson hosted a NYC screening; Victoria Justice, Giuliana Rancic and Joel McHale hosted the LA premiere; Anderson Cooper and Kelly Ripa hosted a NYC screening; Anderson Cooper hosted a town hall special on CNN to discuss bullying with Dr. Phil, Kelly Ripa and BULLY director Lee Hirsch; and Tommy Hilfiger designed t-shirts.

Efforts to pass the Safe Schools Improvement Act are also in the works after The Weinstein Company Co-Chairman Harvey Weinstein's recent meeting with Senator Bob Casey. This bill will amend the Elementary and Secondary Education Act of 1965 to address and take action to prevent bullying and harassment of students.