They’re perfect strangers, but look picture perfect. A Nashville photographer gets millions of views online for her Stranger Shoots, where she picks a man and a woman who don’t know each other and takes posed photos of them together as if they’re a couple. The photos turn out more intimate than ones with real-life partners, with the pair staring into each other’s eyes, touching one another’s faces and waists, and fondly embracing. Ava Butts told The Post that her most successful shoot was with a couple she captured during Christmastime — Neyland and Katie — who she has learned are…