The X Factor's second-season Top 12 acts have now become a Top 13.

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During last week's The X Factor broadcast, finalist acts Willie Jones, David Correy, Diamond White, and Sister C were eliminated from the competition -- determining this season's Top 12 finalist acts. However, judges Simon Cowell, Britney Spears, Demi Lovato, and L.A. Reid apparently discussed afterwards that they didn't make the right decision when it came to one talented act in particular.

"Well, we watched the show back, and the Final 12, we're very happy with. But we believe we made a mistake with one act. We think one act deserves to be in the final. And between us, we've asked this particular act to return and join the finals," Cowell announced during Wednesday night's The X Factor broadcast.

"We had 12 acts and now, apparently, we have 13! So please welcome the thirteenth finalist, Diamond White!" The X Factor co-host Mario Lopez announced.

Once White joined Lopez and fellow co-host Khloe Kardashian onstage, Kardashian asked the young singer, a 13-year-old from Los Angeles, CA, how she was feeling about re-joining the competition.

"I feel awesome and I'm ready to get performing!" said White, who is a member of Spears' "Teens" (16 and under) category. 

White -- along with fellow finalist acts Jennel Garcia, Paige Thomas, Cece Frey, Vino Alan, Tate Stevens, Jason Brock, Emblem 3, Lyric 145, Fifth Harmony, Carly Rose Sonenclar, and Beatrice Miller -- then took the stage and performed individually during last night's show for home viewer votes.