Simon Cowell is said to have secured the singer to perform a duet with one the finalists, most likely teenager Ella Henderson, should she make the final, reports The Mirror.
Beyoncé previously appeared in the 2008 final, singing a duet with eventual winner Alexandra Burke.
"We are delighted to get Beyoncé on the show because she is such a huge crowd pleaser and will make sure the final goes with a bang," a show source said. "The last time she sang with Alexandra it was incredible, and we hope to have her sing a duet again.
"Ella is the one most likely to sing with her because hearing their voices together would be just amazing. The show is still in its early stages, but Simon hasn't wasted any time in trying to line up acts for the final. He wants to get in there before Strictly."
[Beyoncé and Alexandra Burke during the 2008 'X Factor' grand final]
Henderson is currently the favourite to win this year's series, easily topping Digital Spy's weekly polls to find the best singer on the shows so far.
Beyoncé recently dropped out Clint Eastwood's remake of A Star is Born.
The X Factor's grand final will take place in Manchester on December 8 and 9, with One Direction also tipped to appear.
The competition continues next Saturday (October 20) at 8.20pm on ITV1.
Photo gallery - 'The X Factor' series nine - week two results show:
Copyright: Ken McKay/Thames/Rex Features