London: Pop star Katy Perry has credited pop queen Madonna with inspiring her upcoming 3D concert movie. Perry invited a camera crew to film her California Dreams Tour for "Part Of Me", which will feature live footage and touch on personal issues including her failed marriage to Russell Brand, reported a website.

The singer said plans for the forthcoming documentary were inspired by Madonna's 1991 film "Madonna: Truth or Dare".

"Madonna is everything to me, and that movie is amazing, because it caught her at a time when she was a bit more vulnerable. I wanted to do that too, to capture a snapshot of who I am now so that I can remind myself what I've lost if I ever do become totally jaded," Perry said. "Part Of Me" is due in theatres in July.