Sheridan Smith and Jason Donovan are set to duet at the 'Britain's Got Talent' semi-finals.

Sheridan Smith

Sheridan Smith

The 'Cilla' star will team up with the 50-year-old actor and singer to perform a medley of songs from the 'Joseph And The Amazing Technicolor Dreamcoat' musical, in which they will both be starring in when it returns to London's West End later this year.

A source toldThe Sun's Bizarre TV column: "It will be the first time Sheridan has performed songs from the musical publicly, so it's a coup for ITV. Bosses expect decent ratings."

It is not known which day Sheridan and Jason will perform as part of the week long 'Britain's Got Talent' semi-finals, which airs from Monday to Friday, culminating in the grand final next Sunday (02.06.19).

Sheridan has admitted she is "nervous" about going back to the stage as the Narrator in a new version of 'Joseph and the Amazing Technicolor Dreamcoat' as it will be her first time working in London theatre since her troubled run in 2016's 'Funny Girl', which saw her pull out of several weeks of performances due to stress and exhaustion.

She admitted: "I was nervous about going back into theatre in London ... If you sign for a musical, you've got to do a year. But this is a summer season, for ten-and-a-half weeks. Plus, it's lovely to be part of an ensemble - it's a nice way of going back into the West End where there won't be the pressure of me carrying a show. I can't believe that there's no talking - just singing. And the songs are catchy! Everyone knows that because we all did Joseph when we were at school."