The top dog in internet cat stardom, known for her downward smile and bugged-out baby blues, spent her birthday Friday ... She's also such a happy cat." Grumpy is happy and extremely chill ...

Many of you will remember the Grumpy Cat phenomenon of 2012. The brother of Tabatha Bundesen, the tiny feline's owner, posted a picture to Reddit when the now-famous kitty was only a few months old.