Amanda Holden and the cast of Shrek: The Musical are to perform on a Britain's Got Talent lives show.
The actress will have to step out from behind the judges' table and perform the I'm A Believer routine from the West End musical.
Her co-stars Nigel Lindsay (Shrek), Richard Blackwood (Donkey) and Nigel Harman (Lord Farquaad) also star in musical.
Simon Cowell, Michael McIntyre and David Hasselhoff will be in the audience for their co-star's routine.
She told What's On TV: "I think one of the most important things when you're on a show like Britain's Got Talent and judging other people, is to be willing to stand on the stage and put your own self up for judgment.
"Next Tuesday, the audience along with my TV colleagues Simon, Michael and the Hoff will be sitting in judgment of me. I'm just praying they don't use their buzzers!"
Shrek: The Musical is currently previewing at the Theatre Royal, Drury Lane ahead of a full launch on June 14.
Meanwhile, Cowell is to return to the judging panel for the Britain's Got Talent live shows from May 30.
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