Selfie Shown Round The World Of Woman With Two Faces [PIC]

I'm just sitting here trying to make sense of this creepy photo.

Everyone on Twitter is sharing this because if you look at the pic closely, you can see in the reflection behind this couple there is an extra face attached to the back of the female's head.

How is this possible?

The reflection of the face is very similar to the female taking the pic.

Can you figure it out?

[Twitter]