London - Britney Spears finds judging on The X Factor is “electrifying”.

The Hold It Against Me hitmaker - who joined the show alongside Demi Lovato after Nicole Scherzinger and Paula Abdul were sacked after one season - admits she was terrified when she first signed up but eventually got into the rhythm of the talent search.

Speaking on The Ellen DeGeneres Show, she said: “I was really nervous. You have all these people behind you and you know they’re rooting on you. It’s a really exciting, electrifying thing to do.”

Speaking about her judging style, Britney says she learns from the show’s head judge Simon Cowell and always tries to be honest.

She added: “I used constructive criticism. I learned from the best.

“I prefer to be honest. I think that’s the best way to go. I wouldn’t want to be told something and then waste seven years of my life. I feel like it’s the thing to do.”

However, Simon - who judged the UK version of the show before heading up the US adaptation - was shocked at how quickly she made her decisions about wannabe pop stars.

He added: “I’ve never heard someone say no to contestants so quickly in my entire life.” - Bang Showbiz