Don't smile, Grumpy Cat, or else risk losing your new endorsement deal with Friskies. That's correct—the cat food maker has inked a "spokescat" agreement with the frowny feline that's become a Web photo phenomena during the last year.

Owned by Tabatha Bundesen of Phoenix, Ariz., the female white-and-brown cat—her real name is Tardar Sauce—became a social media sensation a year ago when a particularly surly-but-endearing photo was posted on Reddit. Grumpy Cat's Facebook page has since grown to 1.3 million fans, and the kitty accrued 111,000 Twitter followers.

But it's not the first product for the cat, which helped launch a "Grumppucino" coffee drink five weeks ago. Grumpy Cat also reportedly has a movie in the works.

"She's very busy," Friskies spokeswoman Julie Catron told the Associated Press. "The first thing she'll do for us is receive the lifetime achievement award."

Indeed, Grumpy Cat will garner that distinction Oct. 15 in New York as the St. Louis-based Friskies awards the best cat videos of 2013 as chosen by consumers via an online vote.

With so many furry critters potentially on the premises, marketers for allergies medicine Claritin might want to set up a shop outside the event.