Deck the halls with boughs of holly...
Image: YouTube, PurinaFriskies
OK, Grumpy Cat may still be a Grinch, but she is joining in on some of the holiday festivities with her fellow feline pals.
See also: The Internet's 10 Favorite Cats
Grumpy, Colonel Meow, Hamilton the Hipster Cat, Nala Cat and Oskar the Blind teamed up to create a cheerful music video for Purina Friskies called "Hard to be a Cat at Christmas." Who can deny the difficulties of being four-legged this time of the year?

The viral video was created in hopes of raising awareness about shelter cats. For every view the video receives, Friskies will donate one can of food to cats in need. At the time of writing, the video had accrued more than 100,000 views. (The song is also available for download on iTunes.)
At the video's release in Los Angeles, Tartar Sauce (Grumpy's off-stage name) and Colonel Meow threw back some eggnog while discussing their best humbug tactics. The photo op made for a spectacular Christmas card:
Post by Colonel Meow.
While Grumpy Cat may not be jolly as ol' Saint Nick, the festive season seems to have melted even her cold heart a little. An onlooker captured what may be the first and only photo of Grumpy with the slightest grin on her face.

Or maybe her eggnog was just spiked.
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Image: YouTube, PurinaFriskies