Happy Birthday Grumpy Cat!

The little cat we know as Grumpy Cat (formerly Tardar Sauce) became an internet sensation suddenly on September 23, 2012. She was barely out of kittenhood at the time, but her facial expression made her appear to have an attitude problem. Since then, she’s been on everything from TV to coffee cups, and her fame is in no danger of fading. She turned two years old today.

Grumpy Cat celebrated her birthday with a visit to the mental_floss office, where she charmed everyone with her dainty moves that belie her permanent frown. She is the official spokescat for Friskies, and was promoting her company-sponsored birthday celebration taking place later this month.

(Image credit: Erin McCarthy)