Published Tuesday, 17 April 2012
The music mogul gave insider access to investigative journalist Tom Bowers as he wrote new book Sweet Revenge: The Intimate Life Of Simon Cowell.
The Osbourne matriarch declined to be interviewed for the tell-all book and is now furious after learning the tome suggests she "exploded" with rage over Cowell's fling with Dannii Minogue while they were judges on The X Factor.
Osbourne is adamant she knew all along Cowell had been romancing Minogue, but insists she didn't care about their secret relationship.
She tells the Daily Mirror: "I'm not Simon's mother - I don't give a toss who he f****. That's none of my business. I think Simon thought he'd have complete control over this book.
"But how dare he bring me into it now? I don't want to be dragged into his little world of debauchery, thank you very much... I am p***** off to be brought into it all again."
Osbourne, who left the TV talent show in 2008, also admits the Australian pop star was "unbearable" to work with.
She adds: "Dannii wanted to be the mistress of Simon Cowell - and the mistress of X Factor. But I didn't leave the show because Simon and Dannii were f******, I left because she became unbearable.
"She started bossing everyone around, even the producers. We all knew Simon and Dannii were seeing each other, it wasn't a secret. I don't know why he tried to hide it from everyone though - he'd already split from (ex-girlfriend) Terri (Seymour)."