Maci Bookout shared the latest photo of her baby bump with fans on Sunday.

'Teen Mom OG' Ryan Edwards Returns To Twitter, Did He Comment On Maci Bookout's Baby News?

After announcing her pregnancy last month, claiming she had no clue she was expecting until days after her engagement to Taylor McKinney, the Teen Mom OG star took to Instagram, where she showed off her sizable six-month baby bump.

"@ttmlifestyle out here at #ATLSX #thingsthatmatter #ttmlifestyle @tmon3yyy," Bookout captioned the new photo.

'Teen Mom OG' Maci Bookout Faces Backlash After Announcing Third Pregnancy

"I was at the doctor, ironically, to get my birth control prescription refilled!" 24-year-old Bookout told Us Weekly earlier this month of learning the news of her third pregnancy. "I was like, 'Ha ha, that's a funny joke — but it's not really that funny!' And [the doctor] was like, 'No, seriously!' And I was like, 'Oh, OK — well, give me 10 minutes to not freak out"

"Everyone is shocked," Bookout continued. "I mean, even we were completely speechless, and every time I shared the news with someone, I said, 'OK, are you sitting down?' And then I said, 'Feel free to say 'holy s--t' or congratulations because both are fine.' Because that's pretty much how I've been the whole time!"

Bookout's baby boy is due at the end of May, just one day after her second child, Jayde, turns 1.

For more of Maci Bookout and Taylor McKinney, tune into the first half of the two-part Teen Mom OG reunion special, starting tonight at 10 p.m. on MTV, and check out a sneak peek at the new episode below.

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Maci bookout, Teen mom, Teen mom og, MTV, Reality TV, Taylor mckinney