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Glee Exclusive: Demi Lovato Poised to Join Season 5 Cast for Major Arc as Rachel's [Spoiler]

Demi Lovato GleeGlee is adding a little X appeal in Season 5.

Actress-singer and X Factor judge Demi Lovato has signed on to join the Fox musical dramedy’s upcoming fifth season for a significant arc, TVLine has learned exclusively.

According to sources, Lovato (who turns 21 on Tuesday) will play Dani, a NYC-based struggling artist friend of Rachel and Santana’s. She will also interact frequently with Adam Lambert’s incoming character, and the pair will have several musical numbers together.

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Lovato’s deal calls for her to appear in at least six episodes, beginning with the second part of the show’s Beatles’ tribute, airing Oct. 3. (Glee will work around Lovato’s X Factor schedule.)

The Glee gig marks Lovato’s first major acting role since her Disney Channel series Sonny with a Chance went off the air two years ago. Additional acting credits include the Camp Rock films and episodes of Prison Break and Grey’s Anatomy.

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Expect Fox to maximize the cross-promotional opportunities, what with X Factor‘s results show leading into Glee on Thursdays this fall. (I’m calling the tagline: “It’s Demi X 2!”)

Glee returns with Season 5 on Thursday, Sept. 26 at 9/8c.