Sarah Harding's boyfriend is "heartbroken" after she got intimate with 'Celebrity Big Brother' housemate Chad Johnson.

The Girls Aloud singer had been quietly dating Aaron Lacey for two months before she entered the famous abode and he had even moved in with her, but she has grown increasingly close to the 'Bachelor' star and was caught on camera performing a sex act on him earlier this week, much to the devastation of the 33-year-old plasterer.

A source told The Sun newspaper: "He's heartbroken. He fell for her.

"They were inseparable. He supposed her going on 'Celebrity Big Brother' and watched nightly.

"He's devastated she went behind his back."

Aaron is now said to have moved out of Sarah's house and is staying with his parents.

Sarah's antics with Chad have been slammed by some of her former housemates.

Helen Lederer - who was evicted alongside Sandi Bogle on Tuesday (22.08.17) - admitted she was "aghast" at how quickly their romance has progressed.

She told The Sun Online: "I'm amazed and aghast at how rapidly relationships are made.

"I'm shocked. I'm absolutely shocked.

"Good luck to them if that's what works for them. I don't begrudge them a second of their lust."

Despite this, Helen has cast doubt on their burgeoning relationship, suggesting it isn't anything more than lust.

The actress reflected: "From Chad's point of view, he's just done the one programme and hasn't travelled out of America, and bless him, is quite baffled, and eats a lot of eggs and protein...

"I think he is clearly enamoured of this beautiful women who has chosen him."

And Paul Danan, who left the house last week, criticised the 35-year-old beauty for her conduct.

He recently said: "Sarah getting laid in the toilets is not a good look."