'American Idol': Season 9 finale welcomes Christina Aguilera, maybe Adam Lambert?

christina_aguilera_bionic_a.jpg "American Idol" has started lining up acts for the Wednesday, May 26 finale and the first one is none other than songstress Christina Aguilera.

Her official Twitter tweeted April 19, " We've reached over 19,000 followers and this just in, Christina Aguilera will be performing on the American Idol finale!"

No doubt she will be there to promote her new album "Bionic," but what will she sing? The lead single off the album is "Not Myself Tonight," but perhaps she'll debut a new single for the "Idol" finale.

Meanwhile, Adam Lambert, who just appeared on "Idol" as a guest mentor and performer, tells MTV News, "
I hope to come back for the finale. Unfortunately, I'm going to be gone for 'Idol Gives Back.'" Adam is heading back to the United Kingdom to promote "For Your Entertainment," which comes out there at the end of April.

Between now and the finale, we can also look forward to Justin Bieber and Lady Antebellum, both of which pre-taped a live "Idol" performance. Lady Gaga has also announced that she is coming to "Idol" on May 5.

Zap2it has reached out to FOX for confirmation on Xtina's "Idol" performance.

Who else would you like to see perform for the "American Idol" finale?

Follow Zap2it and Zap2it Andrea on Twitter and Zap2it on Facebook for the latest TV, movie and celebrity news.

Related:

Kara DioGuardi sings 'Terrified' on 'Lopez Tonight'
'Idol' on 'Larry King': Simon Cowell on leaving, judging and the Batphone
'Idol': Crystal Bowersox texted Katelyn Epperly, 'Betrayed by Seacrest'
Alicia Keys to mentor for 'Idol Gives Back' week
'American Idol' inspirational songs: What should the top 7 sing?

Photo credit: Bionic