Dannii Minogue has admitted that after the phenomenal success of this years Britain’s Got Talent show, the pressure is on for X Factor to be just as big.

In an effort to keep the ratings riding high, bosses are said to have signed some major stars to perform on this years series. Rumoured singers include Robbie Williams, Madonna and Whitney Houston.

X factor judge Dannii Minogue told The Sun: “Robbie will be great – if he gets himself in shape first!

“He is such a showman, he never fails to deliver.

“I think he’ll come right out to the audience and the judges like Beyonce did last year, and put on a really geat performance.”

She added: “All of my gay friends are begging me for tickets to the Madonna night! It would be amazing to have her on.

“I’m looking forward to Whitney, too. There was pressure on us after Britain’s Got Talent to be as big and as good, and I think we will be.”