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Demi Lovato to Guest Star on 'Glee'

Glee just added even more star power to its cast -- in the form of Demi Lovato.

Demi has signed up for "at least six" episodes of the show, in which she'll play a struggling singer who is friendly with Rachel and Santana. According to TV Line, she'll perform several duets withAdam Lambert, who joined the cast earlier this year.

Her first appearance will come on October 3rd, the second part of a Beatles tribute. Since Demi will also be a judge on this year's X Factor, FOX has move its results show to air right before Glee.

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People : Demi LovatoLambert