Charlotte Chuch and Will Young reportedly performed a karaoke duet in a Welsh pub, surprising the locals who were drinking there.
According to reports, the pair were in Cardiff for their appearances in the Royal Variety Performance and decided to stop off at the Robin Hood pub, which is owned by Church's mother.
The pair reportedly performed a number of their own hits, as well as singing a duet. Young said afterwards: "What a great little pub. I love it here."
A local, who witnessed the impromptu performance, said: "I couldn't believe it. For the price of a pint I got to see two of Britain's biggest pop stars live."