A very unlikely duo from Married at First Sight are rumoured to be "sleeping together".

If there’s one thing we all know for sure, it’s that when Married at First Sight‘s Nasser tells us something, it’s definitely true.

Like the time he had to stay at his fake wife’s apartment, and claimed that a) the bed flew across the room when he was sleeping in it, b) the front door flung open in the middle of the night, and c) the place was obviously possessed.

Nasser. Doesn’t. Lie.

So when the 50-year-old fitness instructor told Kyle and Jackie O on Monday that his fake ex-wife was sleeping with another former Married at First Sight contestant, we wholeheartedly believed him.

“Gab is sleeping with Sean from Adelaide,” Nasser told the KIIS FM hosts. “Apparently she flew down to see Ryan’s gig and [Sean’s fake ex-wife] Jo caught them in the hotel room. The story will come out today – I guarantee it.”

"I tell you, she always had a soft spot for Sean because he used to come into our room to have drinks," Nasser said. "It's one of those things like 'Come on Sean, go home, it's two in the morning.' But him and her used to stay up quite a while."

Of course, the story did come out, just as Nasser predicted.

Both NW magazine AND Woman's Day published stories quoting anonymous sources who said Gab and Sean were in a relationship - with NW also claiming Jo walked in on the two of them sharing a hotel room.