I grew up in the country. We had alot of animals. I saw alot of kittens being born. I've also worked with disabled kids who were malformed. From my experience they seem too round and perfect. It has to be a hoax. Being the curious truth seeker I am I searched some other conjoined kitten pictures.
Ha! and I found your picture at the bottom of the page! One of the kittens died and they stuck to it like the article suggests.
http://messybeast.com/freak-conjoined.htm