Kim Kardashian's buttJust when I thought there was nothing more obnoxious than a selfie, we've now entered into a world of belfies. Belfies = butt selfies and they're totally acceptable now. Clearly, modesty has gone completely out the window.

But still, this trend is fairly new and only few have mastered it. The key to a good belfie is not to try so hard -- or at least, make it look like you haven't tried so hard. If you take a photo and your butt just so happens to be in the picture, so be it. That's a good belfie. But to stand in front of the mirror bent over ... that's just embarrassing.

Well, anyway. Belfies are here to stay. So check out some of the best (or worst? You decide) we've found: