Lil Bub, the kitten-sized adult cat that became an Internet sensation, has died at the age of 8. The sad news was shared Monday by the cat's owner, Mike Bridavsky. He tweeted, "It's me, Mike — Bub's dude. Bub has departed. She's on her way home." Bridavsky went on to say Lil Bub, who was born with feline dwarfism, had been suffering from a bone infection -- although she appeared happy and healthy before dying in her sleep on Sunday. With its huge eyes and long, dog-like tongue, Lil Bub captured the hearts of millions of people, posing for pictures with the likes of Robert De Niro, helping raise more than $700,000 for animals in need and appearing in a TV special and documentary on Animal Planet. "Bub has made a huge difference in the world of animal welfare, and in the lives of millions of people worldwide," Bridavsky says. How many famous cats can you name?