The US reality TV duo - nicknamed Speidi - have been allowed to watch the rest of the house from a secret basement area, while the other housemates believe that they have walked off the show.
Speidi have witnessed the other celebrities gossiping and bitching about them and have sworn to take action when they return to the house.
"This is on. I was perfect until I saw this. I treated all these people with respect," said Spencer. "They are pieces of s**t."
Heidi said: "They are all such jerks."
The Hills star had to warn Spencer to not get too angry, commenting: "Don't get crazy Spencer... You better check it, check yourself before your wreck yourself."
Spencer replied: "All the things I want to say are offensive, so I can't [say anything].
"I'm not going to be able to sleep tonight, I have so much adrenaline... I will not get kicked off this show - don't worry.
"Big Brother knows they're all fake pieces of s**t, so they want real people to expose them."
The duo have witnessed Frankie Dettori, Lacey Banghard, Tricia Penrose and Claire Richards complaining about their behaviour in the house.
Frankie claimed that the pair "lived in a different world", while Tricia said that she was "happier" now they had gone. Meanwhile, Sam Robertson claimed that Speidi "were just dull" and that they had lived "sheltered lives" in LA.
A lot of the housemates complained about Speidi's insistence on not being hugged, having their own water and not using things that had been touched by other housemates.
Speidi responded angrily to the comments and Spencer whispered: "You guys are the dirtiest people."
Heidi commented: "What's with this hugging thing. It's not an orgy house. I hate people who are sheep. I'm not into that at all."
The duo said that they were "done" with Ryan Moloney and Tricia, and spared some of their harshest criticism for glamour model Lacey.
"She shouldn't have ever got to talk to you [Heidi], she's not famous," said Spencer.
"What's the difference between those people and us [Lacey], we're famous and you've been on Page 3 of a newspaper."
Celebrity Big Brother continues every night on Channel 5.