The pair have been seen getting close during their short time together on the Channel 5 show.
After admitting their confusion over the situation, the pair later agreed to share a bed as they cosied up for "cuddles."
But the romance has not gone down well with Sarah's fans, with many slamming the Girls Aloud singer for "faking" her feelings for The Bachelor star.
After the kissing scene aired on Saturday night, viewers rushed to social media to question Sarah's motives.
Many also expressed their concern for the pair and the claims that Sarah has a "secret boyfriend" on the outside.
Taking to Twitter, one viewer fumed: "I'll never condone cheating, Sarah and Chad are just as bad as each other. Fake a** #CBB"
With another posting: "Why are Chad and Sarah trying to hide when every room is under cameras 24/7? FAKE A** #CBB"
"SHE KNEW THE F***ING CAMERA WAS THERE, WHAT A F***ING FAKE REACTION FROM BOTH OF THEM #cbb," added third of their kiss.
While another claimed: "Oh my days Sarah is so fake #cbb"
Sarah has admitted her confusion over her situation with Chad, telling him she felt torn.
"It’s like I want you, I just don’t know…I’m really confused right now," she told the star in the bedroom.
"I don’t want to look like that kind of girl…I love a cuddle, I need a cuddle. I’m just confused," she added.
Celebrity Big Brother continues at 9pm on Channel 5.
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