Reports that Madonna has been left fuming following the release of her brother Christopher Ciccone’s tell-all book may be untrue after revelations emerged that the pop superstar may have written parts of the biography herself.

The Hung Up singer was said to be "devastated" by revelations about her career and personal life in Ciccone's recently released tome, Life With My Sister Madonna.

But, according to PageSix, the singer actually had a part in penning chapters of the book herself.

A source tells the publication: "The supposed scandal about Christopher Ciccone's book is bulls**t.

"She (Madonna) actually ghost-wrote parts of it with him, the way Princess Diana helped Andrew Morton write his book on her. That's why there's nothing too devastating in Chris' book.

"He's mean to others, but not so much to his sister."

A spokesman for Madonna has yet to comment on the reports.