The singer, whose hits include Dirrty, has been booked to sing songs from her new film Burlesque but bosses are desperately trying to persuade her to be Matt’s celebrity partner, too.
The 29-year-old has been approached by Matt’s mentor Dannii Minogue, who fears fellow judges Simon Cowell and Cheryl Cole may try to pinch her for their acts One Direction and Cher Lloyd.
‘A duet between Christina and Matt would be a magical moment – just like when Beyoncé dueted with Alexandra Burke during 2008’s final,’ said an X Factor insider.
‘Matt’s voice is phenomenal and Christina can hit notes no one has dreamed of. They would be a perfect pairing no matter what song they sang.’
Matt, 27, is the bookies’ favourite to win the contest.
An official X Factor spokesman said: ‘We’re not confirming any of our guest performers.’
Source: Metro UK