Simon Cowell has reportedly recruited Rihanna to be a mentor on the US version of X Factor.
The Sun newspaper reports that RiRi will help L.A. Reid chose his final four acts ahead of the live shows.
A source says:
"Simon loves Rihanna and loved having her on the UK show last year - so it's no surprise he wants her back. He hasn't officially announced her yet as he loves keeping everyone guessing. But fans are already getting excited."
Mariah Carey is also confirmed to assist in picking who makes it to the end.