Gigi Hadid is celebrating her "greatest love," daughter Khai, on her 5th birthday. The model, 30, shared photos of Khai via Instagram Stories on Friday, September 19, ranging from current snaps to throwback pics of her pregnancy. "My girl is 5 today ," Hadid shared over an image of herself and Khai in what looked to be a barn. Khai, with her long blonde hair in a braid, wore a denim jacket and fringed brown horseback riding chaps with pink cowgirl boots. Hadid rocked a camo sweatshirt and cap and she squatted by her little girl, whom she shares with ex Zayn Malik.