Simon Cowell and Mariah Carey
Ferdaus Shamim/WireImage; Jeff Vespa/WireImage
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."