Simon Cowell wants apology from Louis

Simon Cowell has ordered his X Factor co-star Louis Walsh to apologise for making jokes about his success.

In his autobiography Fast Track To Fame, Walsh mocks Cowell by sarcastically claiming that his greatest achievements include discovering Sinitta, Zig and Zag, and Robson and Jerome.

However, Simon has now accused Louis of being "cocky" and insisted that his rival judge should show more respect.

"Bearing in mind I've made Louis a multi-millionaire based on my decisions, he should send me a written apology for that," Cowell told The Mirror.

"Before he gets too cocky he should remember that or return the money I've made him! We have enough divas among the contestants, we don't need them on our side too."

Simon has also confirmed reports that Michael Jackson will be appearing as a guest on this year's series.

"I got a call from his people saying he really likes the show and would love to be a part of it," he said. "There are also some other amazing guests. Kylie's doing the live final and Leona's coming on too."