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P Diddy is 'too expensive' to be a judge on US 'X Factor' said Simon Cowell.
When asked about Christina Aguilera as a possible judge he told Jay Leno: 'Absolutely not.'
Asked about Usher, he said: 'Maybe. Yeah I like Usher. He's good.'
Simon also said that he'd already spoken to Shania Twain and Jessica Simpson about becoming judges.
But, he admitted that he can't make up him mind about who he will choose.
'I can't make up my mind. I've been meeting all these people every day and I like them and at the moment I could end up with about 23 judges on this panel. One contestant, 23 judges!'