• Christina Aguilera from "The Voice"

Christina Aguilera from "The Voice" (Photo : Instagram )

Christina Aguilera threw some major shade at Britney Spears, Mariah Carey and Jennifer Lopez. "The Voice" coach allegedly dissed the singers, calling them "old" and a has-been.

According to this week's National Enquirer, Planet Hollywood invited Aguilera to perform with Spears, Carey and Lopez in a "Greatest Hits" set. The diva, however, declined the invitation saying that she does not want to spend three nights a week reliving the past. Aguilera added that she wanted her fans to know more about "The Voice," rather than singing songs of the 90s.

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Early this week, Aguilera's manager Irving Azoff told the press that the "Candy Man" singer will not be performing in Las Vegas because she was still in the "prime of her career."

In an interview with VH1, Azoff said that Aguilera is not ready for a Las Vegas residency. He explained that the singer currently has multiple projects lined up for her. Apart from "The Voice," she is also guesting on "Nashville" and finishing up her album.

"No disrespect to Britney [Spears] or to Jennifer Lopez, who is doing one, or to Shania [Twain], who did one, or any of them, but Christina's not peaked yet," he said.

"She's in the prime of her career. We'll tour the world, but we're not ready to sit down in Vegas."

Fans thought that Aguilera will come to the other singer's defense but instead the diva agreed with his management's statement. She added that she did not want to join Spears, Carey and Lopez in an "oldies act" anytime soon.