Vanessa Hudgens

Is there such thing as a camera that you can wear?

I know it’s childish, but I want to know if there’s such thing as a.. say a necklace that has a tiny lens in it so you can record everything. I’ve heard of a pen camera, and I’m thinking of something similar; only it goes around your neck and is hardly noticeable. So, is there such thing and where could I get it?
Thanks