Maci Bookout's Instagram

Maci Bookout Welcomes A Baby Girl

Bentley is a big brother!

Break out the pink balloons for a very special member of the "Teen Mom OG" family: Maci Bookout is now the proud mother of her very own mini-me!

The MTV star and her longtime beau Taylor McKinney welcomed daughter Jayde Carter, she joyfully announced on Twitter:

Meanwhile, the new papa shared a short, but very sweet, message:

No word or pics to prove the precious peanut has red locks like her mama, so it's a waiting game until everyone is treated to a first glimpse of the tiny lady to see if she inherited that notable trait from her lovable mom.

JC's parents memorably broke the big baby news by hugging the "TMOG" production crew -- talk about a wonderful way to break the fourth wall! -- and then excitedly told birthday boy Bentley about his upcoming title change with a special reveal: a bunch of presents from his little sister on the way.

While the six-year-old didn't quite believe M and T at first -- as evidenced in the clip above -- there was no denying his enthusiasm about this special familial development once everything set in. And making it abundantly clear that he would not be helping with those eventual "poopy diapers."

"I think he understands what it means to be a big brother, especially just cause I have a big brother and he's very close with him," M recently told MTV News about her firstborn. "And Taylor is a big brother, so he's kind of learning from all aspects what his role is gonna be." Fabulous older-sibling-in-training, that's for sure -- looking forward to seeing these two precious kiddos in action!

+ Offer your congrats to the clan in the comments below, and be sure to catch Maci on part 1 of the "TMOG" reunion this Monday at 10/9c!