Cyndi Lauper 'sometimes' signs as Madonna

Singer/songwriter Cyndi Lauper, winner of the Best Musical Theater Album award at the 56th GRAMMY Awards. Photo / Getty Images

Cyndi Lauper, the American singer, has revealed she has signed autographs as Madonna when fans have mistaken her for her pop rival.

The Girls Just Want To Have Fun singer makes the disclosure when she appears on Friday night's Graham Norton Show.

Lauper, who has a very distinctive, high-pitched New York accent, said: "It happens to me once in a while. I just sign Madonna. I don't care and as long as I don't talk I get away with it."

The Time After Time singer and Madonna were pitted against each other as pop rivals during the 1980s.

Fellow Graham Norton Show guest Mark Wahlberg also discusses how he has come to see the funny side of being so often confused with fellow actor Matt Damon.

The father of four - who had a troubled childhood after becoming addicted to cocaine aged 13 - also revealed how he went back to finish school in 2013 to set a good example to his children.

The 44-year-old actor said: "I got my high school diploma recently to teach my kids that they need to buckle down and so they can't say, 'You didn't graduate high school and you are successful so why do I have to go to school?"'