Grumpy Cat is the most famous cat in the world. Grumpy rose to fame almost overnight after her photo was posted on Reddit. In short time Grumpy Cat became a pop culture sensation with over 13 million followers. Grumpy Cat has appeared on countless TV shows, an extensive range of merchandise, is a New York Times Best Selling author, her very own hit Christmas movie, and is the first cat in history to have a Madame Tussaud’s wax figure.