Bella Hadid Calls Niece Khai 'the Biggest Gift': 'I Never Knew That I Could Have This Much Joy'. Bella Hadid is expressing the "joy" she feels being an aunt to her precious niece! The supermodel, 25, talked about sister Gigi Hadid's daughter Khai while chatting with Daily Pop on E! on Wednesday, calling her niece "the biggest gift". #RandomThoughts