It may be the early days of August, but Jenelle Evans' son Jace just celebrated his birthday in Halloween-like, horror-themed fashion.

The adorable "Teen Mom 2" kiddo -- who just turned SIX, if you can believe it! -- commemorated his big day with a zombie-style bash at DefyGravity (an extreme air sports venue in Wilmington). Naturally, the first grader's beaming mama took to Instagram to share some snapshots from the fun-filled "Walking Dead"-esque party.

"#HappyBirthdayJace!!!! Zombie party was very successful!!!" the mother of two added along with the Instagram pic above, which finds her firstborn grinning from ear to ear with his spooky sweet treat. Eyeball, random body parts and some insides on this cake -- oh my!

Meanwhile, J's grandmother Barbara was also on hand to fete her grandson and couldn't help but jump around -- as evidenced in the video below. You go, Babs.

Offer Jace your well wishes in the comments, then check out more photographs from the afternoon affair! And be sure to keep watching "TM2" on Thursdays at 10/9c!