This cat is called Good Friday (more like good fry-day!) and weighs just over 8k. He lives in Liverpool and is raising money for the PDSA on a sponsored weight loss.
Yawn! That is an old photo shopped picture that has been on the web for years.
On a more serious note there is nothing big or clever about letting any pet become obese to the detriment of its health. The tabloids don't help either when they actively encourage people to send in photos.