Farmer Thomas is set to stun Farmer Wants A Wife fans during the upcoming reunion on Monday night as he leaves host Natalie Gruzlewski speechless.

The South Australian, 35, left the finale episode hand-in-hand with school teacher Clarette, 35, after he declared his feelings for her.

Now, a teaser of the highly-anticipated reunion, which was filmed one month after the dramatic finale, saw Natalie, 48, lost for words over something the farmer said.

While the clip doesn’t give away any spoilers, viewers were on the edge of their seats as Natalie exclaimed, ‘You what?!’ while Thomas looked especially guilty.

Trouble was detected as soon as the wheat, barley and lentil farmer entered the room with fellow stars Corey, Jarrad, Tom and Jack.

Farmer Thomas, 35, is set to stun Farmer Wants A Wife fans during the upcoming reunion on Monday night as he leaves host Natalie Gruzlewski, 48, speechless

‘Gosh, Thomas, you look nervous,’ Natalie joked as she gave the farmer a hello hug.

Thomas sported a nervous smile as he then sat down on the couch.

A montage of clips then followed of Natalie grilling Thomas over something he said, as she exclaimed, ‘You what?!’ and, ‘Really, Thomas?’

‘I can’t believe what I’m hearing,’ she added, before crying out, ‘Thomas! Oh my gosh,’ as she groaned and buried her head in her hands.

Whatever has developed in the month since the finale is set to shock fans, as Thomas and Clarette were last reported to be going strong since they wrapped filming.

Viewers watched last Monday as emotional scenes saw Thomas confess his feelings for the school teacher.

The following day, Daily Mail Australia revealed the couple were still happily together.

Clarette packed up her bags and relocated to Kimba to live with Thomas on his farm earlier this year.

While the clip doesn’t give away any spoilers, viewers were on the edge of their seats as Natalie exclaimed, ‘You what?!’ while Thomas looked especially guilty

She is currently working at a local school teaching secondary English.

After realising Clarette was The One, Thomas asked to speak with Rachael and Jess separately to tell them Clarette had won his heart during the finale.

Both ladies wished him well before leaving the farm together.

Making his boldest move yet, Thomas left a handwritten note asking Clarette to meet him at sunset for an important conversation.

Their journey has been rife with drama, and the 13th episode saw Thomas make a dramatic comeback to the show just 24 hours after blindsiding his ladies by abruptly storming off the farm following a spat with Clarette.

Clarette was left reeling from their argument and felt betrayed after discovering he’d been messaging his ex Claire, despite insisting their connection was over.

Thomas was quick to shut down any lingering doubts.

‘I mean it, I swear. The contact’s deleted. No contact at all,’ he insisted.

His emotional plea seemed to work, with Clarette accepting his apology before the pair sealed their reconciliation with a passionate kiss.

‘It was rocky, especially after the whole honesty box disaster, but Thomas realised Clarette was the one,’ a production source told Daily Mail Australia.

Watch the Farmer Wants A Wife Reunion at 9:00pm on Monday, 23 June on Seven and 7plus.

The South Australian left the finale episode hand-in-hand with school teacher Clarette, 35, after he declared his feelings for her