Ulrika Jonsson will try her hand at singing and dancing

The celebrities will be put through their singing and dancing paces in a charity version of BBC One's talent show.

Comic Ruby Wax, This Morning critic Paul Ross, Saturday show presenter Fearne Cotton and Casualty actors Will Mellor and Kwame Kwei-Armah are also taking part.

The eight stars plus one mystery celebrity will sing for the public on Friday in an attempt to get one of eight places in the academy.

The public will be asked to vote for their favourites.

The seven most popular students will be guaranteed a place in the academy, but in turn must choose which one person from the remaining two they want to join them.

Saturday Show's Fearne Cotton begins campaigner for votes

As for the original BBC TV show, it will be hosted by Cat Deeley and Patrick Kielty and led by headteacher Richard Park.

As tutors, England rugby ace Laurence Dallaglio and boxer Audley Harrison will be pushing their fitness levels to the limit while hypnotist Paul McKenna will help them overcome stage fright.

Musical impresario Lord Lloyd Webber will also be popping in to give advice.

Celebrity hairdresser Nicky Clarke will give the stars a make-over and Ready Steady Cook presenter Ainsley Harriot will be cooking.

Money from each vote will go to Comic Relief, which raises money for charities both home and abroad.