"Vampire Diaries" co-star, Ian Somerhalder, is getting in the action, even Instagramming a pic of himself with the ferocious feline! "Me and my new love…" he teased.

For those not familiar with Grumpy Cat, here's a quick lesson: She's an 11-month-old, mixed breed feline from Morristown, Arizona, whose real name is Tardar Sauce (a.k.a.: Tard), and she's famous for the pouty "nothing impresses me" face with which she was born.