Pop superstar Madonna has thanked controversial film-maker Michael Moore for aiding the creative process of her new tour documentary I'M GOING TO TELL YOU A SECRET.

The LIKE A PRAYER singer initially wanted Academy Award winner Moore to direct the movie about her 2004 Re-Invention Tour, and although their schedules didn't overlap Moore still offered his services.

She says, "Michael Moore was very instrumental in helping me, even before I began filming.

"He actually offered to direct it, but he was editing FAHRENHEIT 9/11. He said, 'Can't you delay your tour and do it later?', and I said no.

"He said, 'I'll be there for you if you want to show me stuff, or want me to help out. But just remember one thing: you write the script in the editing room. Just shoot as much as you can'.

"And we did. We had 350 hours. The hardest thing is to edit."

Jonas Akerlund ended up directing I'm Going To Tell You A Secret.