But for Dan and Tamara and Billy and Susie, it was just as shocking.
You see, the intruder couples didn’t actually know that they were intruders until the moment they entered the dinner party.
“It didn’t click for me that this was the fourth week of the experiment,” Billy told 9 Honey.
“I just thought everyone else had a few hours to get to know each other, so I was like, ‘Sweet. These guys are nice and familiar with each other. Cool’.”
Intruder Dan had a similar reaction, admitting that he didn’t know Jessika had already been in the competition for four weeks.
During the dinner party, Jessika attempted to hit on new groom Dan right in front of her ‘husband’ Mick.
“I didn’t know that [Jessika] had been in the experiment for a while. I just thought maybe she had had a kind of failed honeymoon, and she was ready to really give it her best shot with stealing somebody else’s man,” he said.
There’s a new Kardashian rumour and we’re not sure whether to be more shocked by this or the whole Tristan Thompson and Jordyn Woods cheating scandal debacle.
Although Travis and Kourtney have been close friends for years with Travis even appearing on Keeping Up With The Kardashians, a source reportedly told Radar Online that things between the pair have recently progressed to the next level.
"Ever since Kourt has been single, they've gotten closer and closer – to the point where he sneakily stays at her place now," the source said.
"She's really falling for him."
In the past, the pair have also been seen attending church together and meeting for vegan meals.
Honestly, we're kind of rooting for this coupling to be true.
In news that precisely no one asked for (but we are very much enjoying anyway), there's a sex tape from the '90s starring Grant Denyer floating around in the ether and he has no idea who's seen it.
The 2Day FM breakfast host admitted to his co-stars Ash London and Ed Kavalee that he made an “intimate video” back in 1994, but lost the tape and oh, Grant.
You should probably keep a closer eye on things like this.
“I had just turned 18, and I had an older girlfriend, and I didn’t have a camera,” Denyer explained. “I borrowed a Sony Handycam from the media department at high school.