The Teen Mom OG family is expanding! Original series star Amber Portwood has made the happy announcement that she and boyfriend Andrew Glennon will welcome their first child together.

The reality starlet confirmed the news to US Weekly, admitting that while she was initially 鈥渁 little scared,鈥 her fear quickly turned to excitement. 鈥淚 just kind of sat down and thought about it and realized that it was a big step in my life, and it was a good thing actually, and I was happy in about 30 minutes,鈥 she told the outlet.

She also shared her expectant status with fans, uploading a shot of a beach with the words, 鈥淲e鈥檙e pregnant鈥 carved into the sand.

鈥淭hank you everyone for all the kind words,鈥 she wrote. 鈥淚鈥檓 very excited for my future with Andrew and our little family we are starting together. Love always.鈥

The news likely came as a shock for fans of the show, with Portwood, 27, previously stating that she didn鈥檛 plan to have more children due to medications she was taking for her borderline personality and bipolar disorders.

Now, she tells US that she鈥檚 no longer taking meds following a split from her ex fianc茅, Matt Baier. 鈥淚 wanted to see if I was just unhappy because of the things that were going on in my life at the time with him, and I realized after weening myself off I am actually okay. It鈥檚 manageable as long as you have a healthy lifestyle and healthy people around you.鈥

That includes Glennon, who the mommy-to-be met while filming Marriage Boot Camp with Baier, as well as Portwood鈥檚 eight-year-old daughter, Leah, with ex Gary Shirley.

Congratulations to the expecting mommy!

Who鈥檚 your favorite Teen Mom alum? Sound off over @BritandCo.

(Photos via Jon Kopoloff + Alberto E. Rodriguez/Getty)