Peter Andre and the Sugababes are among the stars who will be taking a bow in hit West End musicals for BBC Children In Need.
They and other celebrities will perform a well-known song from the shows at the curtain call for productions such as Wicked and Mamma Mia!
Pop Goes The Musical takes place next month and also sees former Spice Girl Mel C and I'm A Celebrity winner Stacey Solomon performing a showstopper.
Peter will perform the song Unchained Melody in new stage show Ghost - based on the movie - in the famous "potter's wheel" scene.
He said: "They asked me if I would be a part of it by doing that famous clay scene and I was like, 'Patrick Swayze, Peter Andre... there's no comparison, are you sure you want me to do this?'
"So I went and rehearsed and I loved it and it is an amazing scene and the whole show is amazing. My pottery skills are shocking - but the great thing is I don't have to do it, I'm a ghost."
Mel C, who has already had a starring West End role in Blood Brothers, will appear in We Will Rock You, Stacey will take a spot in Wicked and Sugababes in Mamma Mia!
Sugababe Heidi Range said: "It's just such a fun musical and there are so many songs that we can do with the three-part harmonies that really suit us, we went to watch it last week, Jade was in the middle of me and Amelle and she had to console us because we were both crying."
Stacey said: "Some of the best voices in the world come out of musicals and I love listening to them and watching them. And now I'm going to be in one."
Tickets are available at bbc.co.uk/pudsey/ and money raised will go towards children and young people in the UK.