(showbizspy.com) - Madonna's brother Christopher Ciccone has denied reports his sister helped write his tell-all book about her.
The Material Girl hitmaker was said to be furious when Ciccone published Life With My Sister Madonna earlier this month (Jul08).
But the pop superstar was subsequently rumored to have had a hand in the publication - even penning some of the chapters herself.
But Ciccone has now denied that his famous sibling had any involvement in the book.
He tells TMZ.com, "If she did, then she's doing the best acting job I've ever seen. No (she didn't help). Whoever is doing it (making up the stories) is doing me a great favor. I appreciate it."
And Madonna's representative, Liz Rosenberg, has also denied the singer helped her brother put together the tome.