The contestants are still under the impression that the spouses walked out of the show after Paula Hamilton's eviction on Wednesday (January 9), when really they have been spying on the group from the renovated basement.
Today, the Pratts were offered the chance to come up with revealing statements that five housemates of their choice would have to complete about each other.
The chosen people do not know that Heidi and Spencer will be watching the 'Tell It Like It Is' task and deciding who wins a special prize by giving the most honest home truth.
On Thursday (January 10), the couple set a series of probing questions for Lacey Banghard, Tricia Penrose and Ryan Moloney in another secret task, before dumping dog food on the latter's head.
Heidi and Spencer, who were reportedly paid $500,000 (£309,000) for appearing on Celebrity Big Brother, have branded their fellow housemates "pieces of s**t" after secretly watching their exploits from the basement.
Moloney and former Coronation Street star Sam Robertson both face eviction from the Celebrity Big Brother house in tonight's live show, which airs from 9pm on Channel 5.