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Gorgeous Sarah Harding shocks viewers as she appears to perform a sex act on Chad Johnson in front

CELEBRITY Big Brother viewers were shocked when Sarah Harding appeared to perform a sex act on Chad Johnson.

The former Girls Aloud star celebrated getting a double bed for her and Chad with an intimate moment in front of the cameras in the Channel 5 reality show.

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In scenes shown on Sunday night's episode Sarah and Chad were seen in bed under the covers as things became heated.

The Sun reports that, a TV insider confirmed that jiggery pokery went down but producers had to carefully edit the scenes to make sure they weren't too graphic to broadcast.

"There's a lot of heavy petting going down between the couple," the insider revealed.

"Sarah's hand disappeared under the covers and Chad's boxers came off. Viewers can draw their own conclusions about what happens - but it's pretty clear."

Fans flocked to social media to react to the graphic scenes.

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Sarah struggled as she realised everyone except Chad has nominated her for eviction