Michael Slezak
February 17, 2009 AT 11:14 PM EST

Michael Johns and Carly Smithson will perform a duet tomorrow night during the first results-show telecast of American Idol‘s season 8 semifinals, Johns confirmed exclusively to EW.com. The pair, who only got the invitation to sing on Sunday, are still in talks with executive producer Ken Warwick about which number they’ll perform.

Johns and Smithson, who finished eighth and sixth, respectively, on season 7 of Idol, had expected to appear this year during the “Hollywood Week” episodes, where they had served as ”Idol boot-camp” mentors for the current crop of hopefuls; that footage, however, wound up on the editing-room floor. “Ken [Warwick] felt bad about it,” explained Johns, and thus, the duet plans were hatched.

Johns said laughingly that he’s “just a little” nervous to be taking to the Idol stage and appearing in front of the judges, but is excited by the fact that he’ll be able to plug his upcoming debut album, which is slated for an April release, in front of 25 million viewers.

“The thing about Idol is, if you’re respectful of it, and you enjoy it, and you’re a good ambassador for the show, you’re in it for life,” says Johns, who made an appearance last Thursday along with Smithson and dozens of other former contestants at the launch of the “American Idol Experience” at Walt Disney World in Orlando, FL.

More on ‘American Idol,’ ‘AI’ graduates:
‘Idolatry’: Making sense of American Idol’s top 36
‘American Idol’ recap: Hollywood Week, episode 4
Joanna Pacitti out of ‘American Idol,’ Felicia Barton in.
Who is the reigning ‘Idol’ Fashion Victim: Paula, Kara, or Randy?
‘Idol’: The 10 Best — and 5 Worst — Song Choices Ever
‘American Idol’ recap: Hollywood Week, episode 3
 ‘American Idol’: 10 Greatest ‘Hollywood Week’ Moments
EW’s ‘American Idol’ HQ
‘American Idol’: Get the scoop on what 14 of your favorite former contestants are doing now
Fantasia covers ‘Lady Marmalade’! Roof height at venue permanently altered. 

addCredit(“Angela Weiss/Getty Images”)

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