ABC is preparing a bombshell exposé on "American Idol," (search) reportedly exploring the relationship between the "Idol" judges and the show's contestants.

The report will air on "Primetime Live," most likely next month, and has been in the works "for several months," according to Variety.

ABC (search) officials had no comment yesterday.

"Idol," now in its fourth season, continues to garner huge ratings for Fox, with its twice-weekly airings drawing more than 20 million viewers every Tuesday and Wednesday night.

ABC is not only taking on a rival network with the "Idol" piece, but could air its report on a Wednesday — perhaps even following the "Idol" finale May 25.

"Idol" has had its share of controversy over the years. Several past contestants were tossed off the show, and this season the wrong call-in number — used by viewers to vote for their favorites — was flashed on-screen, necessitating an unprecedented "do-over" show.

Another contestant this season, fan favorite Mario Vazquez, walked off the show unexpectedly amid rumors he'd signed a record deal.

And "Idol" judge Paula Abdul (search) — who's raised eyebrows this season with her on-camera demeanor — is featured on the cover of People's May 2 issue.

In the article, she denies that she's "addicted to pills of any kind" and says she's clean and sober.

Abdul judges the show along with Randy Jackson and Simon Cowell. Ryan Seacrest hosts.

Fox officials had no comment yesterday.

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