Hey, Zayn. Now would be a good time to stop whatever you're doing and pay attention to your girlfriend.Said girlfriend, the lovely Gigi Hadid , sent out a Bat Signal of sorts to her pop star boyfriend. It seems the model is not getting her daily dose of vitamin Z — and it's bumming her out.A week after wearing a T-shirt devoted to her main man , Hadid has posted this sweet Instagram. The photo shows the mega millennials being cuddly and lovey-dovey. "Missing you," Hadid captioned the intimate pic.