'Teen Mom' Star Catelynn Lowell Is Pregnant Again

Well, you can't call her a "Teen Mom" anymore!

Catelynn Lowell, famous for her appearances on "16 and Pregnant" and "Teen Mom," is pregnant with her second child. The reality star made the announcement on Twitter, posting a photo of her showing an already growing baby bump.

"#it'sofficial #4months @tylerbaltierramtv," she wrote, confirming that she's already four months along and tagging longtime boyfriend Tyler Baltierra.

Lowell and Baltierra first appeared together on "16 and Pregnant" back in 2009, in an episode that chronicled the birth of their daughter Carly. The young couple decided to give Carly up for adoption, and later appeared on "Teen Mom," which showed how they kept in contact with Carly's new parents.

Now 21, Lowell isn't technically a teen mom anymore, and her mother, April Stotts, revealed that Lowell is excited about the pregnancy. "She was crying when she knew for sure and so I was like, 'Are you happy? Are you upset?' And she was like I’m happy!" Stotts said, adding, "She's keeping the baby."

That begs the question of what will happen with Lowell and Baltierra's relationship; the two have been together since 2009 and were recently engaged, though after appearing on VH1's reality show "Couple's Therapy," they called the engagement off.