One New Jersey woman known only as “T.M.,” has made headlines after a state-ordered paternity test revealed her twins were fathered by two different men.

The woman applied for public assistance and named one man as the father of her twins. But during her testimony, she admitted that within a week of sleeping with her partner, she had sex with another man.

Mohammed called the case the first of its kind in New Jersey, and found that “only a handful of reported cases exist nationwide”. In fact, the judge found only two more cases in America, one in New York City and the second in Denver, Colorado.

The man she had originally named as the father of both twins will only have to pay child support for the twin he fathered.

Called superfecundation, the biological rarity reportedly happens once in every 13,000 paternity cases of twins. Accurate statistics, however, are notoriously hard to gather.