MORRISTOWN, Ariz. — Her owners say Grumpy Cat, whose sourpuss demeanor became an internet sensation, has died at age 7.

Posting on social media Friday, Grumpy Cat's owners wrote that she experienced complications from a urinary tract infection and "passed away peacefully" Tuesday "in the arms of her mommy."

Her owners said "Grumpy Cat has helped millions of people smile all around the world — even when times were tough".

The cat's real name was Tardar Sauce, and she rose to fame after her photos were posted online in 2012. She had more than 2 million followers on Instagram and more than 1 million on Twitter.

Her website says her grumpy look was likely because she had a form of dwarfism.

Owner Tabatha Bundesen founded Grumpy Cat Limited, and the cat made numerous appearances, including commercials.

AP