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Rex Features
Paul McCartney's refusal to appear on any of Simon Cowell's television shows is said to be frustrating the music mogul.
The former Beatle has turned down invitations to take part in American Idol but appeared in Peter Kay's Britain's Got The Pop Factor... talent show spoof.
"We try every year to get Paul McCartney on American Idol. For whatever reason, he won't come on," the Daily Star quotes Cowell as saying.
A source told the newspaper that McCartney's reluctance has "really frustrated" Cowell.
