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Britney vs. Christina: NBC Sets Up Showdown by Adding a Third Night of 'The Voice' -- and Boy, Did the Move Tweak 'X Factor's' Simon Cowell TMZ, TVLine

NBC has added a third night of "The Voice" to the lineup for next week, putting the final evening of the show’s premiere week up against Fox's "The X Factor," reports TVLine.com.

The third season of the "The Voice" was originally scheduled to bow with episodes Monday, Sept. 10, and Tuesday, Sept. 11, but NBC announced Wednesday that it will move a repeat of "America's Got Talent" so that it can air a third installment of "The Voice" on Sept. 12 at 8 p.m., the piece adds.

The move angered "X Factor" creator Simon Cowell, who called the scheduling strategy "a cynical, cold-hearted, unprofessional way of doing business," reports TMZ.com.

Cowell said he believed he had a "gentleman's agreement" with NBC that the two shows wouldn't overlap each other, allowing fans to watch both programs.

"The reason they've done this is they don't want people to see 'X Factor' because they've heard how good the series is. They don't want their audience to see Britney Spears. They don't want their audience to see Demi Lovato," Cowell said, according to the story.

The scheduling move will have "The Voice" coach Christina Aguilera on the air opposite "The X Factor’s" new judge Spears, with the two singers having a relationship that dates back to their parts on "The Mickey Mouse Show" in the 1990s, the story notes.

Cowell appeared to warn of possible friction between the two pop stars, telling TMZ: "Britney's not going to appreciate the fact that Christina -- who has been a bit of a rival -- isn't allowing Britney to have a night of her own."