Yes, his big surprise has been revealed!
Last year's X Factor winner said today that he will take to the stage at Wembley to perform new song 'Slamming Doors', taken from his debut album… and he hinted that there will be a surprise as well.
He tweeted: "Hey guys. Very excited to announce that I will be back performing at @TheXFactor Final this Saturday!... with a lil surprise!"
Now he's revealed that surprise: he will be joined by 2006 winner Leona Lewis! Their collaboration has yet to be revealed. So intriguing!
It's the second time former van driver Ben has performed on X Factor this year. He also sang his single 'Second Hand Heart' back in October. It's the track he collaborated on with Kelly Clarkson.
This year's X Factor finale will be contested between Louisa Johnson, Che Chesterman and Reggie 'n' Bollie who will compete to win that coveted contract with Simon Cowell's Syco Records.
X Factor Final airs on ITV this Saturday and Sunday at 8pm, with Adele, Coldplay and One Direction set to perform on the Results Show.