MJ's Big Blog has a nice roundup of the special guests slated to appear on Wednesday's results show.
Among the highlights: David Cook, Carlos Santana, Black Eyed Peas, Queen Latifah.
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Reportedly, Kris Allen will duet with Keith Urban, Allison Iraheta will duet with Cyndi Lauper and Danny Gokey will duet with Lionel Richie.
Sources say Carrie Underwood will appear on tonight's performance show, singing this season's goodbye song, "Home Sweet Home."