The deal is for one year and was made today at the TV Critics Association Summer Press tour in Beverly Hills.
Depending on if Randy Jackson stays, they still have at least one judge's chair to fill.
The rumor that Adam Lambert will fill that seat is still in effect.
Mariah just released this statement via twitter and facebook: "It's gonna be so much fun working on American Idol. As a singer-songwriter, I'm excited to help find and nurture new talent. LYM!" --MC
So was signing Mariah Carey to Idol a good move for the show to keep it alive?-DocFB
Jennifer Lopez performed on "So You Think You Can Dance" UK last night doing "Dance On The Floor" but what is making more moves than she did on that show is her hinting that she may not be returning to "American Idol" next season.
During an interview with BBC Radio she said she loved doing the show but not sure she would be able to do it next season as she is so busy.
Just to let you know, she was paid $12 million dollars last season.
Let us know what you think of J.Lo's performance and her decision.-Dr.FB
Diagnosis: $12 Million Reasons Why She Stays