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Mariah Carey will assist Simon Cowell when he has selected his top candidates to go through to the live shows on the US version of the ‘X Factor’.

Carey will replace Sinitta, Brad Pitt’s ex-girlfriend and long-running helper on the UK version of the show. She will advise Cowell, 51, when he chooses his finalists from the category he is given to mentor in the final stages of the competition.

However, 42-year-old Sinitta – who previously dated Brad Pitt – is not happy with the decision.

Sinitta told the Daily Star newspaper: “Well, let’s just say feathers will fly if Mariah takes my spot. Although she is a mega diva vocally, you can expect another ‘X Factor’ drama. I won’t just roll over and take it. I hope she can run in high heels.”

In April, Simon spoke of his desire to have Mariah involved with the program, but admitted he was unsure in what capacity.

He said: “I think Mariah will have a role on the TV live shows. I met her recently and she was great. And her idea was to be the judge of the judges, which only Mariah could come up with. She’ll be involved in some form. I literally adore her. I love her to bits.”

Traditionally judges in the british version of the show take potential finalists to a special overseas base.

The audition stages of the ‘The X Factor’ are currently taking place, with singers Nicole Scherzinger and Kelly Rowland..

Music CEO L.A. Reid and Paula Abdul are also judges on the show.