A woman in China has reportedly given birth to a pair of twin boys found to have different fathers.

The result of a DNA test led the new mother to admit that she had cheated on her husband in a one-night stand, according to a report from a Chinese newspaper.

It is said that the husband had felt strange as he thought one of the boys didn't look like him, and after they received the result, he had to question his wife over and over for her to tell the truth.

A mother in China has given birth to a pair of twin boys from different fathers (file photo)

The story came to light when the couple, from south-eastern China's Xiamen city, had to register the birth of their twin sons at the local police station early last year, according to Xiamen-based newspaper Strait Herald.

In order to complete the registration, the couple had to produce the results of a paternity test to prove that the babies were theirs.

The husband, known by a pseudonym Xiaolong, had wondered why one of his sons didn't look like him at all.

But he was still shocked upon receiving the DNA results, which claimed that one of the boys did not have any biological relationship with him, according to a director at the Fujian Zhengtai Forensic Identification Centre.

The centre arranged the paternity test for the couple.

The director, Mr Zhang, said Xiaolong was furious after reading the DNA report and confronted his wife.

The couple reportedly live in the city of Xiamen (pictured) in south-eastern China's Fujian

It is said that his wife initially denied having an affair, and accused her husband of falsifying the results.

Xiaolong further interrogated his wife, who then admitted that she had slept with another guy and that it was a one-night stand.

The father said he was happy to raise his own child, but not the one from someone else, the report said.

Twins being born with different fathers is an extremely rare occurrence known as heteropaternal superfecundation.

Women usually have to have sex with two different men within a day before or after ovulation for both eggs to be fertilised.

The story came to light after the young couple were told to have a DNA test to register the birth of their sons, according to Fujian Zhengtai Forensic Identification Centre (file photo)

Experts say it is hard to calculate the exact odds of the phenomenon, but previous studies suggested the chance could be between one in 400 pairs and one in 13,000 pairs, according to The Guardian.

Similar stories have been reported in China before.

In 2014, a rich businessman from eastern Yiwu city was devastated after discovering one of his twin sons was not his.

According to Sanxiang Urban Newspaper, the father, named Zhou Gang, decided to take his children for a DNA test after realising his elder son had double eyelids.

He said both he and the children's mother had single eyelid, therefore he found it strange that one of the babies had double eyelids.