Katy Perry documents her break-up in concert film
25 June 2012 Last updated at 16:43 BST
Katy Perry says it was important to leave "difficult" parts of her life in her new 3D concert documentary, including her recent divorce.
The film, Katy Perry: Part of Me, follows the pop star on her world tour amid her break-up with ex-husband Russell Brand.
The singer said over 300 hours of footage was gathered from her year-long world tour for the film.