Ferdaus Shamim/WireImage; Jeff Vespa/WireImage
Sara Hammel
August 23, 2011 07:00 PM

It’s official – Mariah Carey will appear on this fall’s buzzy new talent competition, The X Factor, a source close to the show tells PEOPLE exclusively.

Carey won’t be a judge, but rather a guest of a judge – in this case Simon Cowell, who hinted recently the diva was interested in joining the show.

“Mariah is definitely confirmed to be a part of X Factor,” the source says. “She is confirmed to tape something with Simon Cowell at the judge s homes.”

RELATED: L.A. Reid: 5 Things to Know About the X Factor Judge

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