MARRIED At First Sight star Lacey is left fuming tonight as she is forced to move into Luke's apartment in a controversial twist.
This week the remaining couples spend some time apart from their spouse and with another bride or groom from the experiment.
The couples find out who they will be swapping with - but not everyone is happy with the outcome.
Partner swap week is a chance to get a taste of how the other couple's are functioning day-to-day, by spending time in the company of another spouse.
The goal is to learn new skills with their roommates that they can use in their own relationship.
In Lacey and Nathan's apartment, the pair were excited to find out who they'd be spending the next few days with.
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Nathan opened the envelope and revealed that his wife would be moving in with Luke.
Nathan revealed: "Lacey, you'll be paired with Luke."
A furious Lacey replied: "F*** off, am I actually?"
"You've got to move in with him, you've got to go around his house," Nathan said.
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She added: "Why did they pick Luke?"
Nathan said: "What do you reckon his reaction is going to be," with Lacey replying: "Probably the same."
Luke also received the news that he was partnered up with Lacey for the task.
He was seen dancing around his living room and joked: "I'm going to be doing some salsa."
It comes after Luke and Lacey had a falling out on last night's episode, when he indirectly said that she was not "classy" when she salsa danced with Adam on the separate days.
The rest of the pairings include, Kristina and Ross, Kieran and Sacha, Adam and Amy, and Polly and Nathan.