"She never mentioned it." Todd McKenney opens up about his sister marrying his ex-boyfriend.

Dancing With The Stars judge Todd McKenney has spoken for the first time about how his ex-boyfriend, Simon Gallaher, became his brother-in-law.

Speaking to former Big Brother contestant, Ben Norris, on his podcast Word For Word for Joy 94.9, the 53-year-old shared his unusual family history.

“It’s weird isn’t it? I don’t think I’ve ever spoken about it publicly,” he said.

“I’m sick of not talking about it.”

It was an honour to MC the Grace Gala ball for @westmeadkids last night. #circustheme thanks @angelabishop10 @studio10au for inviting me and thanks @vanillabeanevents for the outfit! Loved it….X

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In 1984, McKenney dated performer and musical theatre producer, Simon Gallaher, while they were working together on a musical production of Pirates of Penzance. Many years after their break-up, he found out his sister, Lisa, went on to marry Gallaher. Except he learned this from either in the couple – instead, he was told by his co-stars on the set of Cats.

“She married my ex-boyfriend and is still married to my ex-boyfriend, but just has never mentioned it to me,” McKenney said.

McKenney said he wasn’t even aware Gallaher and his sister knew each other at the time.

“I remember I was doing Cats and there was a newspaper banner outside the news agency, and it said, ‘Simon’s love child,’” revealed McKenney.

“I didn’t know anything about that but I got into my dressing room and the other guys in the show said, ‘What about Simon and Lisa?’”

“And I went, ‘Which Simon?’ They said, ‘Simon Gallaher.’ I said, ‘Lisa who?’ And they said, ‘Your sister!’”

McKenney said he and his sister have a “weird relationship”, but said there are no hard feelings between between them.

“If you’re happy go for it,” he said.

“They got married and have got three kids and I’m close to their kids.”

How lucky am I to have the worlds most gorgeous Mum! Happy Mother’s Day. :)))))))))) xxx

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McKenney said he’d been keeping the secret hidden from the media for years in order to protect his sister’s children. However, now that they’re adults, things are different.

“For the sake of them I haven’t said it, but they’re grown up now and I get on with them and they know the stories now,” he said.

As for McKenney and his sister? Things are civil, although the Rocky Horror Picture Show star admits they’ve never been close and were like “chalk and cheese” growing up.

“We see each other from time to time, but we don’t ring each other. There’s no animosity.”

What do you think of this crazy family dynamic? Can you beat it? Tell us in a comment.