Due to medical issues, American Idol Top 20 contestant Crystal Bowersox is unable to perform on Tuesday's show, Fox confirms to UsMagazine.com in a statement.
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As a result, the guys will compete on Tuesday night's show, and the women -- originally slated to take the stage Tuesday -- will perform Wednesday.
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A source tells Us that Bowersox, 24, is recovering from diabetes complications.
"Crystal is doing OK and should be fine for tomorrow," the source says of the Ohio-based soul-rocker mom.
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On Thursday, two guys and two girls will be cut from the competition. Season 8 finalist Danny Gokey will also perform his new single, "My Best Days Are Ahead of Me."
Lee Dewyze, Andrew Garcia, Todrick Hall, Casey James, Aaron Kelly, Alex Lambert, Michael Lynche, John Park, Jermaine Sellers and Tim Urban, Didi Benami, Crystal Bowersox, Lacey Brown, Michelle Delamor, Katelyn Epperly, Siobhan Magnus, Paige Miles, Lilly Scott, Katie Stevens and Haeley Vaughn are the current Top 20.