As FOX producers prep for the debut of Simon Cowell's, The X-Factor, they are considering replacing a popular judge on the panel. English Sweetheart, Cheryl Cole, is part of the show over seas, but producers are reluctant to adding her to the American version of the show once it debuts. Producers feel that she will relate to the new audience, yet who do thy replace her with on the panel? Three popular U.S. aritist names have surfaced.Sources say that producers have expressed interest in Christina Aguilera and "BFFs" Rihanna & Katy Perry. While Christina seems to be the front runner for the position, producers say that any one of the three could fit-in due to their popularity and success in the U.S. However, Simon is said to still be pushing for Cheryl Cole on the American panel.