THE X FACTOR: L.A. Reid. CR: Nino Munoz / FOX.

THE X FACTOR: Simon Cowell. CR: Ian Derry / FOX

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THE X FACTOR: L-R: L.A. Reid, Demi Lovato, Britney Spears and Simon Cowell on the set of THE X FACTOR airing on FOX. CR: Ray Mickshaw / FOX.

RVM_1830_R_1

THE X FACTOR: L-R: L.A. Reid, Demi Lovato, Britney Spears and Simon Cowell on the set of THE X FACTOR airing on FOX. CR: Ray Mickshaw / FOX.

THE X FACTOR: L.A. Reid. CR: Nino Munoz / FOX

THE X FACTOR: Demi Lovato. CR: Nino Munoz / FOX

THE X FACTOR: Simon Cowell. CR: Nino Munoz / FOX

THE X FACTOR: Britney Spears. CR: Nino Munoz / FOX

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THE X FACTOR: L-R: Britney Spears, Simon Cowell, Demi Lovato and L.A. Reid. CR: Nino Munoz / FOX.

Justin_Bieber

THE X FACTOR: Guest mentor Justin Beiber will appear in the Judges' Homes round on an all-new episode of THE X FACTOR airing Wednesday, Oct. 10 (8:00-10:00PM ET/PT) on FOX. CR: Ray Mickshaw/ FOX

Marc_Anthony

THE X FACTOR: Guest mentor Marc Anthony will appear in the Judges' Homes round on an all-new episode of THE X FACTOR airing Wednesday, Oct. 10 (8:00-10:00PM ET/PT) on FOX. CR: Ray Mickshaw/ FOX

will.i.am

THE X FACTOR: Guest mentor will.i.am will appear in the Judges' Homes round on an all-new episode of THE X FACTOR airing Wednesday, Oct. 10 (8:00-10:00PM ET/PT) on FOX. CR: Ray Mickshaw/ FOX

Scooter_Braun

THE X FACTOR: Guest mentor Scooter Braun will appear in the Judges' Homes round on an all-new episode of THE X FACTOR airing Wednesday, Oct. 10 (8:00-10:00PM ET/PT) on FOX. CR: Ray Mickshaw/ FOX

Nick_Jonas

THE X FACTOR: Guest mentor Nick Jonas will appear in the Judges' Homes round on an all-new episode of THE X FACTOR airing Wednesday, Oct. 10 (8:00-10:00PM ET/PT) on FOX. CR: Ray Mickshaw/ FOX