Exes Gigi Hadid and Zayn Malik have kept their daughter, Khai—who turned 4 on Sept. 19—out of the spotlight, choosing not to reveal her face on social media or reveal many details about the child, including her last name.

Gigi Hadid revealed in a photo from her daughter's 4th birthday party that her full name is Khai Malik, and that the girl's surname is that of her dad, Zayn Malik. The supermodel previously hadn't revealed whose last name Khai took after her September 19,

Zayn Malik's fans are buzzing after Gigi Hadid revealed that her four-year-old daughter, Khai, shares Zayn Malik's surname. In a heartfelt Instagram post celebrating her fourth birthday,