'The Vampire Diaries' star Ian Somerhalder looks pretty young to be a grandpa, but don't let his youthful mug fool you! The smoldering actor's beloved rescue dog, Nietzsche, is having a litter of eight pups!

Somerhalder announced the news with an adorable Instagram update, showing him lying on the floor near Nietzsche with his hand on her belly. Awww!

"The calm before the storm ... Launching Season 5 of 'The Vampire Diaries' & preparing for the launch of a whole part of life -- being a GRANDFATHER," he wrote. "Yup -- I've got my hand on a belly with 8 little ones about to explode out into the world! What I thought was one rescue become 9 -- Mama Nietzsche is a trooper -- babies coming in about 48 hours ... Aunt @thejram & Uncle @polivierjr, GET READY for some BABIES! 2 cats 9 dogs- is that considered a hoarder?”

Here's where it gets weird. Nietzsche was actually spayed, but apparently a little bit too late!

Someone else besides Somerhalder who's excited about the news? His co-star, pal and ex-girlfriend, Nina Dobrev, who took to Twitter to congratulate the future Grandpa: