Grumpy Cat has earned more than a host of big-name Hollywood stars

The moggy, who shot to fame two years ago in a YouTube video that got 15.7 million views, has a film out, Grumpy Cat’s Worst Christmas Ever.

She also appears in adverts, on gift items, and has a best-selling book in 15 languages.

The cat has earned more than Hollywood stars Nicole Kidman, Cameron Diaz, Matt Damon and even Oscar-winner Matthew McConaughey.

Grumpy’s owner, 28-year-old Tabatha Bundesen from Morristown, Arizona, said: “She’s unstoppable.

"What she’s achieved in such a short time is unimaginable and absolutely mind-blowing.