Jennifer Lopez might have 12 million good rea$ons to celebrate signing on to replace Simon Cowell (or is she replacing Kara? Or Ellen?) on 'American Idol,' I'm hearing from friends and insiders that think it's a baaaad idea.

"Why would you want to pay someone who hasn't been able to sell that many records to replace Simon," a friend of the tough Brit tells me. "You would think after the Ellen mistake 'Idol''s producers would have learned their lesson and instead look for someone unknown in the industry rather than a celebrity."