World's most famous cat who became internet sensation and amassed $100m for owner is dead

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The world's crankiest cat, whose permanent scowl inspired countless memes, a best-selling series of books and a movie, has passed away at the age of seven.

Grumpy Cat - real name Tardar Sauce - shot to fame in 2012 in a YouTube video that received 15.7 million views, and went on to amass a $100M fortune for her former-waitress owner Tabatha Bundesen.

But her family from Morristown, Arizona, took to Instagram this morning to announce the news that she'd died on Tuesday from a urinary tract infection, saying: 'Some days are grumpier than others'.

The internet sensation was born with feline dwarfism and an underbite, which caused her famous expression.

However her condition also brought with it a number of health complications, including infections, which experts say drastically reduced her lifespan.

Heartbroken fans have rushed to pay tribute to the much-loved pet online, with one summing up the feelings of many by writing: 'We are all a bit of you.'