Despite their formerly on-and-off relationship, Gigi Hadid and Zayn Malik appeared to be living happily ever after. Their daughter, Khai, was born last year and Zayn seemed to become a part of the tight-knit Hadid family. But, as we all know by now, there's no way of telling what goes on behind closed doors. In an explosive, and disturbing, new series of reports, the former One Direction singer has been accused of domestic assault involving Gigi's mother, Yolanda Hadid. Click through for everything you need to know.

[Photo via Instagram]