Apparently, Paula Abdul is easily replaced. The Mirror reports that Abdul left American Idol, purportedly over a pay disagreement, and resigned via Twitter Tuesday, writing, "With sadness in my heart, I've decided not to return." Thursday, reports from unnamed sources say that Victoria "Posh Spice" Beckham will guest judge in at least two episodes for roughly $260,000. Beckham's spokesperson declined to comment on the matter. American Idol is America's most popular show, drawing 26.3 million viewers per episode on average. Sky News is reporting, meanwhile, that Beckham's publicist has confirmed that she has agreed to make a "one-off" appearance on Idol.