Celebrity Big Brother viewers were left "disgusted" after contestants Chris Hughes and JoJo Siwa urinated in cat litter trays during a feline-themed task on Friday's episode.
The pair shocked audiences when they took their roles as house cats too far by relieving themselves in the props provided for the challenge.
Host AJ Odudu first aired the footage on Thursday's Late and Live spin-off show, visibly appalled and describing the act as "disgusting".
The incident has sparked outrage on social media, with many viewers calling the behaviour "attention-seeking" and "vile".
The scene unfolded in full on Friday's flagship show with the celebrities dressed as cats for an upcoming task. Initially, it appeared to be a whimsical situation.
However, things quickly took a turn when Hughes asked Siwa to guard the changing room door, telling her: "I need a wee."
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The former Love Island contestant then requested: "Can you block the door? Don't tell anyone I've weed though."
Siwa obliged, positioning herself by the door in her furry outfit as Hughes hovered over a box filled with cat litter.
"Wait a minute, because you're giving me stage fright," he told her before proceeding.
Viewers were left aghast and quickly took to social media to express their dismay over the contentious act.
ITV CBB: Chris Hughes suggested using the litter tray
ITV
"Chris needs to get a backdoor eviction for that piddling. Did he even wash his hands after?" one person posted on X.
Another viewer remarked: "Chris' only excuse is that he was drunk. That's not sober behaviour."
"Ewww he is disgusting," commented a third while another viewer wrote: "I feel so nauseated. They're so so weird."
The situation escalated when Chris attempted to cover his tracks by smoothing over the litter tray, inadvertently coming into contact with what was presumably his own urine.
ITV CBB: Chris Hughes and JoJo Siwa caused outrage with their conduct
ITV
Big Brother swiftly intervened after the incident, issuing a clear warning to the contestants.
"This is Big Brother. House cats are reminded that they can use the human toilets," announced the voice over the speakers.
The warning came after both Hughes and Siwa had used the litter trays, with Hughes reportedly watching as Siwa also urinated in the tray.
Many viewers pointed out that the behaviour was not only inappropriate but inconsiderate to production staff.
"Some poor underpaid sod on the lowest rung of the production team backstage is going to have to clean that out," wrote one viewer.
The pair's close relationship has been a significant talking point throughout this series of Celebrity Big Brother.
Earlier in the week, they were punished for breaking house rules when Siwa was seen writing a "secret message" on Hughes' hand.
In a previous episode, Hughes was also heard saying Siwa would be "temporarily moving in" with him after leaving the house.
He also raised eyebrows when he told Siwa that her memory skills during a game were "a big turn on".
The "litter tray" incident occurred during the same episode in which Olympic athlete Daley Thompson was evicted from the Celebrity Big Brother house.
Earlier in the week, Thompson and EastEnders actress Patsy Palmer had been nominated for eviction, with the public voting to determine who would leave.
The nomination announcement had caused emotional reactions among housemates, with Ella Rae Wise visibly distraught and in tears.
Many contestants were surprised that only two housemates had been nominated for eviction this time.
The cat litter incident has drawn comparisons to another historic Big Brother moment involving politician George Galloway and actor Rula Lenska acting as cats.
