Check out these celebrity look alike images:
My celebrity look alikes
Image by ~John~ After these guys put up there celevrity look alike (abchick, evaxebra, paul cook and scampion) I was inspired to try my hand at this. (I lost my html powers please search for these people there work is really good) I tried two pictures, my conclusion? Always wear sunglasses
Second Tresha Celebrity Look-alike
Image by OhKyleL Used a different picture of Tresha and got a completely different group of celebs. There can not be any science behind this thing.