Simon Cowell believes ''real chemistry'' is more important than attracting celebrity judges for 'X Factor' USA.

The music mogul is currently recruiting two new mentors to the panel of his pop star search show after Britney Spears and L.A. Reid quit but he isn't looking for star power.

Demi Lovato thinks Simon Cowell has a huge heart.

The 'Heart Attack' singer admits that her 'X Factor' USA boss - who was once dubbed TV's Mr. Nasty - is really nice behind the scenes and she has a huge amount of respect for the British music mogul despite having disagreements with him on the show.

Demi Lovato claims rehab showed her who her real friends were.

The 'X Factor' USA judge says checking in to a treatment facility to help her overcome her struggles with bulimia and self-harming in 2010 was a life-changing move, especially because it proved who actually cared about her.

Cheryl Cole is set for a return to 'The X Factor' USA.

The 29-year-old star has held talks with Simon Cowell about being a judge on the talent show again two years after she fell out with the music mogul when he fired her from the programme after she made just three appearances in the first series in 2011.