Also taking to the stage will be Michael Watson (Jersey Boys), Lauren Samuels (Bend it Like Beckham), Laura Tebbutt (Forbidden Broadway) and Sophia Ragavelas (Cats) who will perform a tribute to Rodgers and Hammerstein.
The casts of Dogfight, In the Heights and Sweeney Todd will also perform. In addition, there will be a specially commissioned song to mark the 15th anniversary of the awards.
Further performances will be announced shortly.
Presented by Mel Giedroyc and Steve Furst, the 15th Annual WhatsOnStage Awards Concert is directed and devised by Russell Labey, with choreography by Nick Winston, musical supervision by Alex Parker, lighting design by Derek Anderson and sound design by Simon Fox. It is produced by Stuart Piper and Jason Haigh-Ellery.