According to Shin Min Daily News on Friday, the 26-year-old Chinese woman, Ms Shi Si Mei, had identified the Channel 8 star as the father of her 19-month-old daughter.
She told reporters that she had met Cao, 45, at a party in Shanghai two years ago. They had a one night stand and continued to keep in touch.
She also claimed that she visited Singapore a month after at Cao's invitation, and stayed at his home for two weeks.
A month after she flew back to Shanghai, Ms Shi discovered she was pregnant.
According to Lianhe Zaobao, Cao was spotted yesterday driving Ms Shi and her daughter to a lawyer's office to arrange for the DNA test.
They emerged from the lawyer's office half an hour later and proceeded to a nearby eatery. There, Cao was seen feeding the child.
When approached by a reporter while they were on the way to the carpark, Cao appeared surprised but calm.
He told the reporter that he was "not ready" to give a statement yet and to give him some time adding, "this is an invasion of privacy". Cao reportedly turned to Ms Shi and said, "Are you happy now?"
Cao then drove mother and daughter back to their hotel.
Ms Shi told Zaobao that she will be flying back to Shanghai in a few days time, before returning a month later to collect the results of the DNA test.
She added that Cao's stance towards the matter has changed, and if proven that the girl is his, he is willing to take responsibility.
Cao had previously denied fathering a child, telling Shin Min Daily News that "there's no such thing".
