Trust me, just about everyone is curious about which celebrity they look like. The website MyHeritage will show you who your famous look-alike is, but if you're not sitting at a computer then add the Face Double App to your iPhone!
It makes more sense to have this free app on your iPhone, too, because you can snap anyone's face in the ideal orientation and find out who your evil celeb twin is anywhere.
I also like it for those times when you're staring at someone, trying to figure out who they look like. Next time, just snap an iPhone picture and use this — instant gratification.