SIMON Cowell is furious after a list of the 12 final X Factor acts was posted on the internet.
The music mogul is now thought to be considering taking legal action over the leak.
He's said to be "very, very disappointed" at the revelation ahead of this weekend's round of the show, which is set in the judges' houses.
The episodes will see the remaining 32 acts from the boys, girls, over-28s and groups categories whittled down to the final 12, who will perform in the live shows.
A source said: "Simon is very, very disappointed.
"Simon is a complete perfectionist. This was not part of the plan. Everything is stage-managed to within an inch of its life so this will not be looked on favourably."
The acts themselves are made to sign a confidentiality agreement so the outcome isn't ruined for fans of the ITV show.
The Sun