Nope, that picture hasn't been altered. Could've fooled me. WebUrbanist explains exactly how the picture was taken, though:
What looks like two photographs put together is actually a single,Think that's cool? There are 14 more images over there to look at. The photography skills are awesome. And if that's still not enough, here's another 15 examples of fauxtoshop.
untouched shot taken by Emily, the blonde on the left. The left side
shows a mirror, reflecting Emily’s image back to the camera, and at
right is her friend Alisha, seen through clear glass. The ghostly hand
and arm in the photo are part of Emily’s barely visible reflection on