It’s no secret that the producers of American Idol like to keep the names of performers on finale night under wraps.
But some things are certain -- Crystal Bowersox or Lee DeWyze will be crowned the season 9 champ on Wednesday, and fans will see the last of Simon Cowell before he jumps over to X Factor in 2011.
But a source confirms to PEOPLE that Paula Abdul will appear on the finale. "The appearance was supposed to be a surprise for Simon," the source said. "It's a ratings grab. And it's a one-time thing ... She and Simon are still close."
Another source says a special send-off is planned for the cranky judge and will feature other Idol alums.
And among the superstars taking the stage? Watch for a great performance by Christina Aguilera.
Tell us: Who do you want to see perform on Idol’s finale night?
Sign up for PEOPLE's American Idol Finale Live Blog to talk with editors about Lee and Crystal's big nightTsuni/Gamma
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