Sharon Osbourne risks sack from The X Factor after launching shock attack on boss Simon Cowell

The judge – who is due to return to the ITV panel for the live shows – said Cowell is a “f***ing pain in the a***” who "will do whatever" to get his "f***ing fat face on TV".

She also labelled performers on the show as “f***ing karaoke”, adding that they are "little sh***".

Speaking on US radio, Ozzy’s wife also said she is demanding £10million from Cowell as her contract means she must be paid the same as the highest paid stars on the talent show.

Her sickest attack came when shock jock Howard Stern asked her which of them she would save on a sinking boat.

She replied: "We would put a f***ing brick around his neck and throw him over. I will drown you mother f***er. Absolutely…he’s gone."

The music manager then claimed she plans to demand more money from Cowell.

She claimed: "So Simon I have a clause in my contract in my contract 'favoured nations’.

“Simon goes to the press and goes this is the best £10million I have ever spent.

"So I go, ‘I have favoured nations, where is my f***ing £10million? I have a clause. I am a businesswoman."

Sharon then told the host she is “waiting to hear” about whether she would receive a pay rise.

She went on: "But after I just said I am going to tie a brick around his neck and let him drown and now I am talking about it, he will be f***d.”

Sharon also shot down reports her salary was only £1million, ranting: "I am not f***ing doing it for a million. It is a principle – you want me you have to pay what I am worth.

"And the thing is these networks aren't used to it. Because people are always half way up their a*** for a gig. And at my age I won't f***ing beg."

Asked why her contract changed this year so she didn’t appear at the auditions, she blasted: "Oh f*** I don't have to have those kids singing in my face.

“Those little sh***. They all suck. It is like hey is this f***ing karaoke or what?"

Sharon vowed to be more brutal when she returns to the live shows.

She said: "The thing is it is the end of my contract now, it is like no holds barred. It is like get the f*** off the stage. You're s***. Get the f*** out."

Sharon also made a swipe at the new line-up, which features Robbie Williams and his wife Ayda Field.

She said: "Listen to this he has got two f***ing people in the show. He has changed the panel. Robbie Williams, he's a good guy, and he has got his wife on."

When Stern asked “what does she know?”, Sharon replied: "I don't know. She was in a soap opera here years ago."

Sharon later asked Stern: "Are you giving me a job when I get the f***ing sack?"

Her comments came as she spent an hour on satellite radio station Sirius XM.

Sharon added that she understood Cowell's desire to take over as head judge on America’s Got Talent from Howard Stern in 2016.

But then attacked him, adding: "Simon loves to be on TV. And he wasn't on TV in America and he will do whatever he has to do to get that f***ing fat face on TV."

Sources close to Cowell expressed shock and horror about Sharon’s outburst.

A pal said: “It seems untenable for her to continue on the X Factor given this attitude. Simon will be absolutely furious.”

An X Factor spokesman declined to comment.