In a major twist, Perez - who has been living in secret for the last few days - returned to the house, shocking his housemates.
Not happy to be back in his company, a worried Michelle then told pal Katie Hopkins she thinks Big Brother will now deliberately keep Perez in the house.
"They can keep him in," she said. "Come on, we know how this works."
Despite Katie suggesting Perez may go soon as he is now eternally nominated, Michelle didn't seem too convinced.
Accusing Big Brother of ensuring Perez is on CBB until the end, the 46-year-old continued: "If they really listened to the public, and the public really voted, maybe there would be a chance."
Having clashed with Perez in the past, Michelle questioned his motives for being on the show, claiming they aren't as sincere as hers.
She added: "I don't care if he goes to the final, I don't care if he takes my place in the final... what I care about is this voice being heard. He's not in here for that, he's in here for self-serving, narcissistic reasons.
"I'm going to fight to get [a place in the final]... What if I get to the final and I lose out to that. Then all of my fight in here has been for nothing. He says he hates the British public, I adore [them]."
Michelle's upset comes after viewers saw Perez return to the CBB house, after carrying out a secret task.
While his housemates thought Perez had walked from the show, the American was hidden away watching this year's CBB stars over the last few days instead.
Last night, Perez returned to the house to learn he will face eviction every week, as he is eternally nominated for the rest of his time on Celebrity Big Brother.
After falling out with most of his housemates before his staged exit, it's unsurprising many didn't enjoy having him back in the CBB compound.
While Cami Li was not impressed to see the 36-year-old after learning he had nominated her, Katie H made sure to tell Perez she was happy he had gone.
Something tells us there's plenty more drama coming way!
Meanwhile, Patsy was the third housemate to be evicted from Celebrity Big Brother.
Speaking to Emma Willis, she said: "I knew I would be very boring in there, and I was!"
Her exit follows Alicia Douvall who was second to go, after Chloe Goodman was the first.
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