Kelly Osbourne Defends Mom Sharon In Furious Twitter Feud With X Factor Judge Dannii Minogue

Sept. 19 2010, Published 10:29 a.m. ET

Kelly Osbourne has taken to her Twitter page to attack Dannii Minogue, the popular Australian singer/actress who is a judge on Simon Cowell's X Factor in the UK. And it's all because of stories Dannii is telling about Kelly's mom, Sharon Osbourne, RadarOnline.com has learned.

Dannii, younger sister of Australian pop superstar Kylie Minogue, has a new autobiography about to hit stands. In it, Dannii claims Sharon Osbourne mistreated her from their first day on the X Factor set together, berating her for not telling the press what a "nice person" she was. Dannii says the encounter left her in tears and ruined the entire season of the show for her.

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Dancing with the Stars Alum Kelly, always the great protector of her family name, has gone Twitter-wild over the accusation.

"Dannii is the devil!" Kelly wrote.

And, "to the 12 Dannii fans out there I ask you this question, what would you do if someone wrote a book of lies about your mother?"

X Factor, created and executive produced by Simon Cowell, is coming to US television Fall, 2011. Cowell moved his good friend Sharon onto the judges panel of America's Got Talent when he launched that show in 2007, and there is speculation he might move her again to his US X Factor bench next year.