Fat Cat Facts

You have a picture in your mind of a " Fat Cat" is that of a rather plump feline sitting on a 

settee, with a glass of cognac and a fat cuban cigar. You have seen pictures of fat cats,
or know someone that has an enormous looking cat eating bonbons that looks more like a hedgehog, than from feline species. Why do cats get fat? Is it the fact that they ate too much turkey at Christmas time, or too many cheeseburgers at the local drive through?