Simon Cowell begs Katy Perry and John Mayer to join The X Factor in US
Simon Cowell is dishing out a generous sum of money to get Katy Perry and John Mayer on board
Katy Perry was a guest judge on The X Factor UK in 2010
Britney Spears quit US X Factor after just one season
A source says: 'Simon sees it as a brilliant pairing.
'Katy's sassy, honest and a huge star, while John's more reserved.
'Having them as rivals would be genius - if they had on-air bust-ups, it'd be unmissable.'
Katy was a guest judge on the UK X Factor in 2010 and Si's said: 'She'd be fun because she's hard - in a good way.'
Our source adds: 'There's a $20 million deal on the table.
'Hiring Britney Spears didn't work but this would be the first time a couple appeared on a judging panel together.'
Read more about Simon Cowell, Katy Perry and John Mayer in Now magazine cover dated 4 March - out now!