Gemma, 34, was said to be at home in Essex when she got into a row with Alex Moss, who she dated briefly 10 years ago and apparently began seeing again in August.
Emergency services were called to the property and Gemma was reportedly treated for injuries - believed to be bruises.
A police spokesperson told The Sun: "Police were called to an address in Worley, near Brentwood, following reports a woman had been assaulted.
"Officers went to the location and the victim was assessed by ambulance paramedics but did not need hospital treatment.
"Police inquiries into the incident are continuing. A potential suspect has been identified and is being sought."
Reveal has contacted Gemma's rep who has confirmed the report.
Meanwhile, it has been widely rumoured that Gemma will be taking part in this year's I'm A Celebrity...Get Me Out Of Here!.
The ITV1 show kicks off on Friday (14 November) and it is thought Gemma will be jetting out to Australia this week before heading into the jungle with fellow celebrities.
The star has kept tight-lipped about the whispers, however, and was all smiles in Essex yesterday.
Following the success of her first boutique, Gemma launched a new store in Brentwood but did not mention I'm A Celeb when chatting to fans.
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!