Susan Boyle has revealed that she has been upset watching the musical of her life story.

'I Dreamed A Dream', the touring show depicts Boyle's unusual rags to riches story on UK TV show,  'Britain’s Got Talent'.

Boyle is played by Rab C Nesbitt star Elaine C Smith (pictured left with Boyle) but has gone on stage herself most nights to sing the title song.

Boyle said: “It’s funny when you see people playing people who you knew. It’s very surreal. 

"To begin with it was upsetting because I was not used to it. Once I got into it though, it was quite clever and amusing.

“It was dead funny seeing Elaine pulling on the wig. I went, ‘Oh my God, what’s this?’”

She said the show, which has toured Britain, could go to Australia next. “I’ve been invited to go along but I don’t know when."

Watch one of Susan Boyle's cameo appearances in the musical below: