Gigi Hadid had a very special Sunday with her two Valentines, her boyfriend Zayn Malik and their four-month-old daughter Khai.READ: Gigi Hadid reveals daughter's unique name in the BEST wayThe supermodel kept fans updated on their special day over the weekend and shared several never-before-seen pictures of the pair, who have been dating since 2015."I love you, Valentine && love the Valentine we get to share forever," Gigi captioned a black and white picture of them taken last month during