"I'm absolutely scarlet for Sarah Harding" added another.
A fourth fan posted a snapshot of a pained looking Steve Carrell from the US version of The Office alongside the caption: "My level of uncomfortableness watching Sarah reenact her girls aloud days."
But the blonde singer found many fans in the house with Sandi and Derek among those busting out a few moves to her performance.
Meanwhile, #teamharding began trending on Twitter with many fans rooting for the Girls Aloud singer.
Earlier, some viewers expressed disappointment that Sandi Bogle and Helen Lederer were evicted on tonight's show instead of her.
One wrote: "Sarah is going to win #CBB and it's going to be funny because every housemate wanted her out each week."
Another added:"Funny thing is I wasn't even a Sarah Harding fan like that before #CBB now I love her!!"
A third chimed in: "Would love to show the haters they will never make Sarah lose her fans. Like her, we are loyal."