5. Grumpy Cat
With her permanent scowl, Tardar Sauce (aka Grumpy Cat) certainly has nothing to be angry about. Although her famous face is caused by an underbite and feline dwarfism, she has become a star on and off the internet. Her face has been on the front of magazines and appears on her own line of merchandise, YouTube, Facebook and other internet sites. In fact, this grumpy girl has over 429,000 followers on Instagram and has even appeared on the hit reality singing show, American Idol, as well as Sesame Street.