It’s the first child, though, with husband Jeremy Calvert, 23, whom she married last April in Kentucky.
“Jeremy and I are excited to be adding a new addition to our family,” Leah, 20, tells Us. “Being a teen mom was difficult, but I’m older and in a different place now – married to Jeremy and excited for our family to grow.”
Leah filed for divorce from her first husband (and dad of twins Ali and Aleeah, 2) Corey Simms in April 2011.
Leah added, “Ali and Aleeah can’t wait to meet their new brother or sister. We feel incredibly blessed and look forward to this next chapter in our lives.”
Teen Mom 2‘s third season premieres Nov. 12 on MTV.