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Rex Features
According to Extra, sources have hinted that the 'If U Seek Amy' star will perform on stage during Wednesday's show, which will see Adam Lambert and Kris Allen competing to be crowned the season eight winner.
Other stars confirmed to perform include Lionel Richie, Carlos Santana, Cyndi Lauper, Queen Latifah, Black Eyed Peas and Keith Urban.
Former Idol winner David Cook will also be present, while fourth season victor Carrie Underwood will perform this year's farewell song, a cover of Motley Crue's 'Home Sweet Home'.
Speaking to MTV News, a show spokesperson admitted that further acts would be added to the roster but branded reports that Michael Jackson would be there as "just rumours".
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