Walsh takes over from Amanda Holden who announced in August she is pregnant. Holden, who originated the part at the Theatre Royal Drury Lane, will play her final performance on 3 October, two months earlier than planned. Walsh takes over the role from 5 October 2011.
Kimberley Walsh is a member of Girls Aloud, one of the UK's most successful pop groups, alongside Cheryl Cole, Nadine Coyle, Nicola Roberts and Sarah Harding.
Below we've got the first image to be released of Walsh in costume as Princess Fiona, as well as an earlier publicity photo.