Get all the details from the 'Teen Mom OG' cast member -- including Bentley's sweet reaction to his brand-new sibling.

Roses are red, violets are blue, Maci Bookout and Taylor McKinney have a special Valentine's Day surprise for you: The "Teen Mom OG" couple is having a baby! Fitting of the romantic holiday, Bentley and Jayde's mama made the exciting announcement on her Instagram account.

"#makingmoremoneys baby boy coming soon! happy valentine's day! @tmon3yyy #lastbutnotleast," she captioned the sweet snapshot above, beautiful bump and all.

Shortly before sharing her life-changing news, the 24-year-old spoke exclusively with MTV News about her impending arrival and when she learned that she would be a mother of three.

"I found out I was pregnant with baby number three right after we got engaged," Maci reveals, as seen in the video above. "It was not expected or a planned pregnancy."

So how would Maci -- who is due on May 30 and will potentially have Irish twins (Baby JC was born on May 29 and M went early with both of her kiddos) -- compare this pregnancy to her previous two?

"Because it's the third one, you know what's going on. You've been there, done that a couple times now, so it's sort of laid back," she divulges about her second son.

So how did Bentley and Jayde react when they heard about their brand-new sibling? Watch the clip to find out and be sure to offer your congratulatory messages for Maci, Taylor, Bentley and Jayde in the comments. Stay with MTV News for more pregnancy updates and catch the family every Monday night on "Teen Mom OG" at 10/9c!