Christina Aguilera has blasted Simon Cowell for being mean to contestants when he was on the American Idol panel.

The Candyman singer is currently a mentor on The Voice and admitted she doesn’t watch rival TV shows such as Cowell’s The X-Factor and American Idol.

Aguilera also admitted that she doesn’t understand why Simon was needlessly mean to contestants when he sat on the American Idol panel.

Speaking at the Billboard/Hollywood Reporter Music Conference, Aguilera said: ''I've not actually seen a full episode of any of the other music shows. I saw the commercials early on of American Idol of Simon being a d**k. I was like, 'Man, that's not what it's about!' I didn't want to treat people like that. I wanted to do The Voice to show that we can be positive. We don't have to knock people down.''

The 31-year-old singer also claimed that she has to be tough to survive in the music business because people will try to walk all over her.

She added: ''It's hard being such a powerful woman in the business. I'm known for not always being warm and fuzzy, because you'll just get bulldozed over.

"You learn to put up this little protective shield, but it's because of something. In my music, I come off as being very open about being insecure, vulnerable and sensitive sometimes. Then I'll go onstage and be this powerhouse force to be reckoned with.''