It’s been reported by Musical Theatre News that BGT judge Amanda Holden will perform live on next Tuesday’s installment of BGT – on ITV1 at 7:30pm – along with the cast of Shrek the Musical.

Amanda and several of her cast mates will perform ‘I’m A Believer’ from the hit musical which is currently playing preview performances at London’s Theatre Royal on Drury Lane.

Amanda, who of course plays Princess Fiona in Shrek the Musical, said of performing the track live on BGT, “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!”

There’s a clip of Amanda and the cast performing the song after the jump…