The spouses were last night (January 9) instructed to stage a walk-out after surviving eviction, but instead of leaving were taken down to the newly-refurbished basement, where they have been spying on their housemates ever since.
Today, the former stars of The Hills were given the chance to compile a list of questions that would be posed to the housemates of their choice by Big Brother in the Diary Room.
Their chosen victims were told that the questions came from Celebrity Big Brother viewers, and were unaware that the Pratts were watching their responses.
Big Brother also provided Heidi and Spencer with a 'drop' detonator, which would release a load of dog food onto the head of one housemate at the end of their interview.
After posing Banghard, Penrose and Moloney questions such as 'Which housemate do you like the least?', 'Who is the fakest housemate?' and 'What did you really think about the housemates who have left?' - for which the couple themselves were counted - Heidi and Spencer chose to spare the ladies and give Moloney the messy surprise.
Banghard inadvertently caused issues for the couple earlier in the week when Heidi broke down in tears at the prospect of Spencer going mouth-to-mouth with her in the shopping task.
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