To those who have been living under a rock for the past few days... we hope it's a really warm rock.
But this just in: it's cold outside. Really cold. Downright freezing, in fact, due to a weather phenomenon known as a Polar Vortex.
What is that, exactly? Watch the following video for details, but all that really matters is this: it's pretty much the exact opposite of Kate Upton.
How are celebrities handling such weather, which is affecting nearly every region of the country? Let's find out, Twitter style...
Joan Rivers: It is so cold here in New York, this morning while my dog was licking himself, his tongue froze to his crotch.
Jimmy Kimmel: A #PolarVortex sounds like something Mr. Freeze would use to destroy Gotham City… or a new flavor of Powerade.
Steve Martin: I'd like to apologize for calling Polar Vortex winter. It's actually more of a spring.
Cameron Diaz: I want to thank all the peeps that braved the #polarvortex to come to the 1st signing of @TheBodyBook at @BNBuzz I hope you enjoy the it
Andy Cohen: #ColdAsBalls
Vanilla Ice: I CAN'T BELIEVE IT'S FREEZING COLD HERE IN SOUTH FLORIDA, I DON'T LIKE THE COLD. LOL BRING BACK THE SUN AND THE FUN.
Elizabeth Banks, finally, sums up this week with one simple photo: