Is it normal if i really like someone i forget what they look like

I can pull up pretty much anyones face in my memory EXCEPT if its someone i'm into.... I dont know why it happens. I cant remember my current crush face for the life of me even though I last saw him two days ago. I can remember his clothes and the way he stands and walks and all that stuff and I can vaguely recreate memories of him from the back, like what he looks like from the back, but when I try to turn him around so I can see his face it doesn't work. I can't remembr a single thing about his face no matter how hard I try. Is this normal?
Its like some kind of facial blindness. It only happens when I develop interest in someone