'Married At First Sight': Blair and Mat spark dating rumours after sharing nude pics

Blair Rachael has shared a racy photo exchange between her and fellow Married At First Sight participant Mat Lockett, hinting that they're an item.

The photos in question both feature the Season 5 stars covering their private parts with a cut watermelon.

"IT'S A WATERMELON PARTY," Rachael wrote alongside a topless shot, tagging Lockett's page and telling her 41k followers to "check my insta story for Matty’s version 😏".

"When Matty Lockett sends you nudes," the 31-year-old captioned the corresponding image.

Their matching snaps had many followers confused, including fellow MAFS bride Davina Rankin, who asked the pair in the comments, "am I missing something here you two??"

The Bondi-based blonde wrote back to the Queenslander, insisting that she's only got eyes for one of her MAFS co-stars.  

"I’m saving myself for you my love," she told Rankin.

If Lockett's recent Instagram presence is anything to go by, the Melbourne tradie has gotten pretty comfortable in his birthday suit of late.

In addition to the watermelon sext, the 32-year-old posted a video in which he completes a nudie run on a dare, making $20 in the process.

Baring his "tramp stamp", as one commenter put it, the former groom (who fittingly travelled to his wedding pantsless on the show) proudly streaked down a busy street, much to the amusement of his mates.

"Don't ever say the word never! Dare you to get nude, done!" he captioned the flashback video, adding the hashtag "#howamisingle".

Lockett also had a flirty chat with MAFS bride Ashley Irvin, who commented on a photo of the plumber's new haircut on Tuesday, writing, "What a 10" alongside two fireball emojis.

"I think it's a zero on the sides and a 3 on top," he quipped back, adding: When ya in melbs next I need you for a car karaoke babe"

As yet, there is no news on whether or not Lockett also sent Irvin a watermelon pic.