Tabatha Bundesen

Grumpy Cat celebrates her birthday on The Couch on April 4, 2014. (credit: WLNY)

Happy Birthday Grumpy Cat! Friskies To Throw Big Party For Internet Sensation In NYC

Grumpy Cat, whose real name is Tardar Sauce, rose to fame after Tabatha Bundesen’s brother posted a picture of the frowny feline on Reddit.