Britney Spears has reportedly banned attractive female staff from working on the US 'X Factor' because they make her feel insecure.

Britney Spears has banned pretty female staff from working on the US 'X Factor'.

The 'Toxic' singer - who joined the panel of the reality TV show as a judge this year alongside Demi Lovato, Simon Cowell and L.A. Reid - has reportedly told producers she doesn't want any attractive women working backstage while she is on the show as they make her feel insecure.

A source told the Daily Star newspaper: "Britney has stipulated that none of the female backstage staff working with her are too pretty or stylish.

Britney recently claimed she is a "very subtle" 'X Factor' judge and tries to be constructive in her advice for the auditionees.

She said in a promo clip for the show: "So far everything has been so fun for all of us.

"Everything is like a new experience for me, so it's a lot of fun and the talent has been amazing.

"I feel like my judging style is very subtle. I try to use constructive criticism."

Despite saying she is "subtle", Britney - who has been described as an "incredibly tough" judge - is seen in the video dispensing some harsh words to one contestant.

She tells the hopeful: "I wanna know who let you on stage."