In one photograph, Matt can be seen down on one knee at a picturesque tropical location while a delighted Olivia looks on.
The bride-to-be appeared overjoyed as Matt presented her with a striking diamond-encrusted ring featuring a brilliant centre stone.
Olivia captioned the post with a playful but heartfelt message: 'Farmer DOES want a wife haha. We have built a beautiful life over the last four years.
'Taking the leap to alter our lives, buying a home, having a little one, and trusting each other through the ups and downs. Here is to another chapter.'
Farmer Wants A Wife stars Matthew Young and Olivia Benic are engaged after meeting on the Channel Seven dating show four years ago
The couple's celebrity friends quickly filled the comments with congratulatory messages.
'Ahhhhhh omg congratulations guys!!! You are both so so beautiful, so happy for you,' wrote fellow Farmer Wants A Wife alum Georgie Lavery.
'So so happy for you both. And Cairns too xxx,' added former cast member Clarette Annalisa.
In August 2024, Olivia and Matt welcomed their son, surprising fans after keeping the pregnancy private throughout.
The pair announced the arrival on Instagram with an intimate photograph of themselves cradling their newborn and an emotional message.
'286 days of carrying you, eight hours of labour without pain relief, and what has felt like a lifetime of waiting... Our little bubba entered our little family happy and healthy,' they wrote.
'Thank you to our close friends/family/baggy clothes (haha) for helping us to enjoy this wonderful experience privately and with so much unconditional support.'
Since meeting on Channel Seven's matchmaking series in 2023, Matt and Olivia's relationship has continued to flourish.
The reality stars, both 27, announced their engagement Saturday night with a gallery showing Matt's proposal in Cairns, Queensland
Olivia beamed as Matt presented her with the diamond-encrusted engagement ring, which features a sparkling centre stone
