The details come after KC and Drew called time on their relationship.
According to photos obtained by Daily Mail, the intruder couple are no longer together.
In the snaps, Sydneysider KC Osborne and Queenslander Drew Brauer were seen arriving separately for the cast reunion which was filmed in Lilyfield, Sydney, on January 15.
KC was pictured looking nervous and upset, suggesting it wasn't an easy split for the dancer.
At one stage, she buried her head in her hands in despair.
Last week, Married at First Sight's KC and Drew stayed at her Cronulla home during homestays on Monday. However, all was not as it seemed.
It turns out that the property the pair were filmed staying - and bickering - at was not actually KC's home, but a $300 per night Airbnb.
The three-bedroom house with a pool is advertised as 'Windsor House' on the popular website.
While photos on the Airbnb page perfectly match the shots of KC's home featured on Monday's episode of MAFS, the reality star was heard describing one of the bedrooms as "my room" in the episode.
This space had the same bed, pillows, painting, lamps, blanket and bedside plant as the rental.
While it's not uncommon for rental properties to be used as locations on the show - as has been done with Connie and Jon this season - the problem is that producers had KC lie and say that the home was hers.
Just another MAFS fail to add to the growing list...