Madonna's brother Christopher Ciccone plans to release a tell-all memoir about his superstar sibling - set to be published without the singer's permission.

Ciccone, 47, is penning the tome with infamous celebrity biographer Wendy Leigh, who has written intimate biographies on Liza Minnelli and Grace Kelly - and is due to be released next month (Jul08).

The book, published by Simon & Schuster, is reportedly: "Ciccone's extraordinary memoir is based on his life and 47 years of growing up with and working with his sister - the most famous woman in the world."

However, the book is allegedly set to be released without the Material Girl star's consent, with the star's publicist Liz Rosenberg stating: "Madonna has not cooperated with any biography about herself."

Madonna's relationship with her younger brother is said to have become strained in recent years, even though the pair worked together intimately in the early 1990s, with Ciccone serving as artistic director on the star's 1991 documentary In Bed With Madonna, and designing and directing her Girlie Show tour in 1993. (MJ/WNWCAG/PAW)

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