Singer and X Factor panelist Demi Lovato has admitted that she's enjoying being part of the show because she gets to wind up her boss and the programme's creator, Simon Cowell.

Speaking to Jimmy Kimmel, the beauty explained that the highlight of her day is often messing with Cowell on the set and it's always a lot of fun to go to work:

"It's pretty amazing that I get the privilege to get paid to mess with my boss all day. Behind the cameras, when we're not on the panel, we do get along really well. He says the sign of being able to tease each other is a sign of comfortability (sic) - and I say, 'Yeah it's just a sign of me still hating you.'"

She also revealed that she didn't have an interview for her judging position and even joked that she was "too busy" for Cowell's "little show" before signing a contract: "

"I didn't have an interview, I'd never really met him. I had met him on 'American Idol' a couple of times but he didn't remember me... don't worry about that, he knows me now. He knows what he's doing, he's really smart and I hate him."

"He just called up one day and I was like 'I dunno, I'm too busy for your little show. Britney who?' and then he begged me so I said OK."