X Factor's Louis Walsh was apparently left red-faced after his mum revealed his real name was Michael Vincent.
The silver-haired judge invited his mum Maureen, 76, to come to the ITV studios to watch the live show - and it seems she let the truth slip during the warm-up.
"The warm-up guy was speaking to guests to keep the audience on a high. At one point he had a chat with Maureen," a source told The Sun.
"I don't know if he'd been tipped off but he decided to ask Maureen if Louis was his real name and she said it wasn't. It was hilarious, nobody could believe his real name was so ordinary.
"When Simon Cowell came back into the studio he admitted he had no idea of Louis's secret and thought it was brilliant.
"Poor Louis was a bit red-faced. He got well and truly set up by his old ma, intentionally or otherwise."
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