Stars of new X Factor spoof musical I Can't Sing! were fine-tuning their performances today as they prepared for the production's premiere.

The show, which features characters based on figures from the programme such as Simon Cowell and Louis Walsh, has been written by Harry Hill and has its official opening on Wednesday.

The stars performed songs from the production at a photocall staged at the London Palladium in readiness for the launch. The show - currently in preview - is understood to have incorporated references to Simon becoming a father for the first time, to baby Eric.

Nigel Harman - who plays the Cowell-like show boss - was joined on stage by Ashley Knight, playing a caricature of Louis Walsh, and Victoria Elliott, whose Jordy is an exaggerated version of Cheryl Cole.