Stars including Geri Halliwell will tread the boards in the West End to raise money for Children In Need.
The former Spice Girl will appear in Singin' In The Rain, while X Factor winner Alexandra Burke will perform in Les Miserables and boyband Blue will join the cast of Jersey Boys.
Other names taking part include Macy Gray, who will appear in the Michael Jackson tribute show Thriller Live.
Halliwell, who appeared with her former bandmates at the closing ceremony of the Olympics, said: "I have a thing for rain, so I am very excited to be performing in the West End musical Singin' In The Rain and it's all for BBC's Children In Need.
"Just imagine - for one night I get to perform in this classic musical."
Last year, celebrities including Peter Andre and Mel C took part in the theatrical fundraiser.
Tickets for the special performances cost £80 and will go on sale at http://www.lastminute.com/pudsey