Simon Cowell says he could turn Leona Lewis "bad"

X Factor judge Simon Cowell believes he's capable of turning last year's X Factor winner, Leona Lewis "bad".

Cowell, Leona's manager insists that the 22-year-old actress really is as squeaky-clean as her reputation suggests - but joked he could give her some tips if she ever wanted to go over to the dark side, he said: "She really is that sweet. Leona is too good to ever turn bad. She should hang out with me more!"

Cowell also compared Leona to Whitney Houston, he said: "Leona is definitely as good as Whitney Houston is now.

"Leona was amazing on 'X Factor', but I was worried her voice wouldn't come over as well on a record. But she sounds even better on her new album."

Leona's new single 'Bleeding Love' has become the fastest selling record in the UK this year.

Leona's new single, Bleeding Love', which was released this Monday, is outselling Take That's 'Rule The World' by two-to-one and selling more copies than the entire top 10 combined.