Macy Gray - Macy Gray Performing In Michael Jackson Tribute Show For Charity

The I Try hitmaker will appear in Michael Jackson tribute show Thriller Live, while Halliwell will take to the stage for Singin' In The Rain as part of the Bbc's Children In Need Pop Goes the Musical 2012 fundraiser, in which stars perform theatre cameos to raise money.

Halliwell says, "I have a thing for rain, so I am very excited to be performing in Singin' In The Rain - and it's all for Bbc's Children In Need."

British singer Alexandra Burke is also taking part by performing in Les Miserables, while boy band Blue will join the cast of Jersey Boys.