TV
Rex Features
According to The Mirror, Moss was offered £50,000 to be the music mogul's celebrity guest at the judges' houses stage but has opted not to appear because she is too busy.
Walsh is now said to be drawing up a wishlist of female stars for the role, which so far includes Mel B, Lily Allen and Charlotte Church.
A source said: "He wants a great person to help."
The latest round of the competition will see the Irish judge picking his final three acts for the contest in Italy.
Kylie Minogue has already been tipped as her sister Dannii's helper, while Will Young reportedly appeared alongside Cheryl Cole in Morocco.
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