SIMON Cowell is so desperate for the next season of his UK TV talent series The X Factor to be a roaring success - and beat rival Strictly Come Dancing - hes planning to get Madonna to appear on the show. Cowell is hoping the Queen of Pop will join the likes of Beyonce, Westlife, Take That and Britney Spears by becoming a guest mentor who guides contestants appearing on the show. Cowell is said to have asked network bosses to find the cash in their budget to fund a one-off deal with the Holiday singer. SS Simon is the most powerful man in TV these days and hes in a position to call the shots. ITV are happy to back him - and hes determined to repay their faith by getting the biggest names in the world, including Madonna, a source said. Madonna, 50, is currently in the middle of her Sticky&Sweet tour in Europe. SS