Backstreet Boys will release a documentary to celebrate their 20th anniversary. The five piece - comprised of Brian Littrell, Nick Carter, A.J. McLean, Howie Dorough and Kevin Richardson, who rejoined last year after taking some time out - have hired Katy Perry's Part of Me 3D co-producer Stephen Kijak to direct the tell-all movie.

"We always wanted to make a film and now is the ideal time. With Kevin back, the fact that we are masters of our own destiny, a new album in the works and our 20th anniversary -- it all adds up to being the right time to share our story," the group said.

Stephen has promised it will be a no holds barred look at the group and revealed their openness was one of the main reasons he wanted to work with them. "What drew me to this project is their openness and willingness to push themselves into uncomfortable places, to be vulnerable and honest," he told The Hollywood Reporter.

The group are also working on plans for a 20th anniversary tour and album.