"Teen Mom OG" star Maci Bookout has officially added to her brood again.

The reality star and her fiance, Taylor McKinney, welcomed a baby boy on Tuesday and named him Maverick Reed.

It's Maci's third child and her second with Taylor.

"Mr. Maverick Reed has officially made his debut & completed our family," she wrote on Twitter on May 31. "So much love, so many blessings!"

The 24-year-old already shares son Bentley, 7, with ex Ryan Edwards and daughter Jayde, 12 months, with Taylor.

Prior to the birth, Maci told MTV why she chose the non-traditional name.

"Maverick was actually one of our boy name choices when we were pregnant with Jayde before we knew it was a girl," she said. "Reed is a family name for both our families."

She added that they discussed the name Connor, but felt that Maverick "went better with the names Bentley and Jayde."

It's been a whirlwind of a 2016 for Maci so far. In January, Taylor proposed to Maci after being together for three years. They are set to marry in October.

Some certainly thought this day may never come. Taylor's hesitation to propose was an ongoing story line on "Teen Mom."

"It's so to the point where I'm like, 'Really, what is the deal?'" she told Us Weekly in December. "Marriage is something I want in my life. In my opinion -- and I think Taylor would agree -- we pretty much are already married. So it's kind of like, 'All right, what are we waiting on?' I'm confused."

She found out she was pregnant just two days after the proposal.

"I was at the doctor, ironically, to get my birth control prescription refilled," she said. Upon hearing the news that she was pregnant she joked that the doctor had the "wrong results" or "mixed them up."

The couple now has no plans to procreate again, with the reality star saying, "There are going to be some permanent birth control decisions made."