12lbs is nothing. xD Bigger than our female cats, but our male is 18-20lbs, and the cat I catsit for has got to be at least 20, probably 22lbs. But our 18lb male is a Maine Coon, and the cat I cat sit for is a Norwegian Forest Cat Maine Coon mix. *phew!*
But that pic of your kitty is cute though! I've always wanted an orange and white cat.