Married At First Sight

Married At First Sight's Gabrielle Bartlett and Sean Donnelly secretly hooking up

And Sean's jilted ex wife Jo McPharlin caught them at it!

Just when you thought the never ending partner swapping from Married At First Sight's season five had come to an end, Gabrielle Bartlett and Sean Donnelly have become the latest pair from the controversial series to give it a go.

During a mini-MAFS reunion at co-star Ryan Gallagher's comedy gig in Adelaide on May 19, NW can exclusively reveal that their friendship finally ahem flirty – and Sean's jilted ex-wife Jo McPharlin caught them at it.

"Ryan's show was at the Arkaba Hotel so some of the guys had rooms upstairs," an insider tells us of the shock MAFS romance.

"Gab flew over especially to spend time with Sean as they haven't stopped talking since the show wrapped and one thing just led to another."

The insider adds that Jo later stumbled upon the pair leaving the same hotel room and quickly put two and two together.

"Jo couldn't believe her eyes! She gives them her blessing but it was a bit of a surprise."

Discussing her close bond with Sean, 34, in March, Gab, 44, gushed to TV WEEK, "I've become very firm friends with [him]… he's a great bloke."

We wonder how Gab's ex-hubby Nasser Sultan will react?

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