Madonna’s brother, Christopher Ciccone, whom the superstar had a falling out with years ago, is writing a tell-all book that is said to be quite venomous.

A source spoke with the New York Post, refusing to give specific details but did describe the book as, “extremely graphic and devastating.”

“He wrote it on the sly without telling Madonna. They want to put it out before her lawyers can get a hold of it.”

A friend of Madge’s said, “We’d heard rumors, but didn’t realize he’d actually written it. He was there through the crazy years and has many stories to tell, I’m sure. He’s seen it all. Oh, my.”

The New York Post describes the reason for the falling out between the two siblings:

“Ciccone – a gay decorator/chef once described by Rupert Everett in Everett’s biography as “a solid raft for Madonna in the shark-infested waters” – was ditched by his sister after she hooked up with her now husband Guy Ritchie, who Everett said was “uncomfortable around queens.”

See, Madonna isn’t as “gay friendly” as everyone would like to believe. One of my sources once dished that Madge attended a show put on by gays – I think it was in honor of her birthday or something – and she brought her then rapper boyfriend (who I have a hunch was Coolio, although I don’t know for sure). When an older drag queen went up and serenaded her, the rapper kicked him in the shins. With some big ass shoes on. The rapper did this repeatedly, as he performed, drawing blood through his thick tights. Madonna did nothing to stop it, and in fact, laughed throughout. My source spoke with the performer afterward and he was saddened but not shocked. He was just a sweet, fragile, older guy, who adored Madonna…and look where it got him.

She’s a cold, hard bitch in my opinion (sorry Lala!) and I can’t wait to hear the dirt!