Everyone has been talking about Britney Spears’ performance at the MTV Video Music Awards – and now Simon Cowell has had a pop.

X Factor’s Mr Nasty has insisted that her performance of new track Gimme More at the event could have “killed her career”.

Simon told The Sun: “If I had been looking after Britney I’d have taken one look at her in rehearsals and I wouldn’t have allowed her on stage.

“It would have been worth pulling her off the bill – no matter what the cost – to save any chance she had of resurrecting her career.

“She wasn’t ready for that show in every possible way. The song wasn’t right, the image wasn’t right and she just wasn’t rehearsed.

“If she had turned up and given that performance at the X Factor auditions then I wouldn’t have put her through to the next round.

“The problem she has now is that she could have killed her career. It’s difficult to come back from that performance, for a while at least.”

What do you think? CLICK below to watch Britney’s performance at the VMAs:

http://www.youtube.com/watch?v=-TgqXTwFK-A