The Script's Danny O'Donoghue was shocked when he mistook a male singer for a woman.
The Irish frontman is a judge and mentor on the UK version of talent show The Voice.
The panel must sit with their backs to the hopefuls who audition for the series - and they can only see what they look like after they have performed.
Danny admits he has been surprised a few times when he has finally laid eyes on the wannabe stars.
"There was a moment I was expecting to see a female and it ended up being a man," he confessed.
The Script have enjoyed worldwide fame after being championed by U2 and releasing hit singles such as The Man Who Can't Be Moved and For the First Time.
Danny's fellow judge Jessie J is confident that the 31-year-old singer will prove just as popular when The Voice hits screens in the UK this weekend.
"Danny's the sweetest guy; he'll be the heartthrob," she gushed.
Sir Tom Jones and Black Eyed Peas star will.i.am complete the line-up for the judging panel.
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