So, the other day I posted some Katy Perry nipple slip pictures, but I couldn't tell if there really was a nipple slip, because the pics were quite small, and lo-res. But now we've got the Hi-res versions, and we can confirm that there is, in fact, a Katy Perry nipple slip happening here. As you can see in the pictures, the reason we couldn't tell before is because Katy Perry has very pale nipples. Who knew!? Well, now you do.