Alexandra Burke sings for CiN
Famous pop-stars are taking over West End theatres to raise money for BBC Children in Need.
The BBC charity's appeal night is coming up in November, and their project called Pop Goes The Musical gets famous singers to perform in West End shows.
X Factor winner Alexandra Burke took to the stage to perform in the world's longest running musical Les Miserables.
You can find out more about it on the BBC's Children in Need website.