The musical theatre star will join the charity event as a judge
Michael Ball will join Barbara Windsor and Christopher Biggins as judges for this year's West End Bake Off.
The event, held in aid of Acting for Others, takes place on 16 July at St Anne's Church courtyard. Shows bake cakes which are judged and then sold from 11am to 1pm.
Participating shows this year include Charlie and the Chocolate Factory, The Mousetrap, Guys and Dolls, Les Miserables, The Railway Children, Showstopper! The Improvised Musical, Titanic, Thriller Live and Wicked.
Last year's West End Bake Off raised £4,000 for charity and The Mousetrap won the trophy.
Acting for Others is an umbrella organisation representing 15 theatrical charities offering support to members of the entertainment industry who have fallen on hard times.