There's another (mini) fella in Maci Bookout's life: The MTV star is a proud mother of three!

The Teen Mom OG cast member -- who announced on Valentine's Day that she was expecting a boy -- has welcomed son Maverick Reed with fiancé Taylor McKinney, MTV News can confirm. The little guy -- who was born at 12:35pm ET and weighed in at 7 pounds 11 ounces -- joins big brother Bentley and sister Jayde Carter (plus pups Bonnie and Clyde) in the family fold.

And even though the tiny lad just made his debut, Maci and Taylor are already proudly introducing their bundle of joy in the video below. What a handsome peanut!

Back when the Tennessean memorably disclosed on the romantic holiday that she would soon add another munchkin to her brood, she opened up about her third pregnancy (as seen in the clip below) and how this experience differed from her previous two.

"Because it’s the third one, you know what’s going on," the 24-year-old told MTV News. "You’ve been there, done that a couple times now, so it’s sort of laid back." Well, now the fun really begins!

Be sure to offer your nice words to Maci, Taylor, Bentley, Jayde and Maverick -- and stay with MTV News for more updates about sweet Baby M! And exciting Teen Mom OG news: The brand-new season will begin on Monday, August 22 at 10/9c!