US TV
Rex Features
According to In Touch, the singer was enlisted by husband Nick Cannon, who was recently unveiled as the new host of the NBC reality show.
"Mariah is a superstar and rarely does TV appearances, but this is for her husband," ContactMusic quotes an unnamed source as telling the magazine.
Carey has been slated to join returning judges Piers Morgan, Sharon Osbourne and David Hasselhoff for a one-off episode later this year.
The insider added: "In addition to her stint as a guest judge, she's even planning on being a regular in the audience."
Cannon will replace departing host Jerry Springer, who announced earlier this month that he was stepping down to focus on other commitments.
Tube Talk
'Being Human': Episode 2 teasersTen tantalising teasers about episode two of the new Being Human.
2012-13 Season
Melissa McCarthy pilot picked up by CBSEmmy Award winner's untitled comedy with husband Ben Falcone gets late nod.
US TV Interviews
Randy Jackson on 'Idol' fainting, pressure: Q&AFive singers faint - and one falls off the stage - on most intense Hollywood Week yet.
US TV Ratings
Mandel's 'Mobbed' climbs to 8.8m for FoxThe latest Mobbed is once again helped by a strong American Idol lead-in.
