Access Hollywood has learned from reliable sources that Jennifer Lopez has been scheduled perform on "American Idol" on April 11. J. Lo joins a long line of big time acts to take the "Idol" stage over the years, including Prince, Mary J. Blige, Rascal Flatts, Shakira and more. Access has also heard very strong rumors that Gwen Stefani is slated to perform on "Idol" on March 28th.
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