Madonna Madonna052208_34_X17.jpg After some of the stunts Madonna's pulled in her career, embarrassing the Material Girl isn't an easy task - but if anyone can do it, her brother can!

Page Six reports that Madonna's brother Christopher Ciccone has collaborated with a British journalist to write a "brutal" tell-all bio of his famous sister described by a source as "extremely graphic and devastating". The two Ciccone siblings used to be close, but had a falling-out years ago after Madge hooked up with her hubby Guy Ritchie.

Apparently, Christopher managed to write his book without tipping his hand to his sis. "He wrote it on the sly without telling Madonna," Page Six's source says. "They want to put it out before her lawyers can get a hold of it."

And boy are her lawyers going to want to sink their teeth into Chris' book - as one of the singer's friends told Page Six, "We'd heard rumors, but didn't realize he'd actually written it. He was there through all the crazy years and has many stories to tell, I'm sure. He's seen it all. Oh, my."

No wonder the book's getting such a wide release - Simon & Schuster plan to print up a whopping 350,000 copies for the book's big release next month! Needless to say, we can't wait to read it - what kind of dirt do you think Chris is going to dish?