Gigi Hadid is positively smitten with motherhood. Mommy moment: Gigi Hadid dished on the exciting times as her two-year-old daughter, Khai, enters her toddler years in an advance clip from her up coming interview with Willie Geist on Sunday TODAY 'I think she's a genius,' Gigi gushed to Geist. Tune in: Gigi's full sit down interview will air on NBC …