leah-messer-pregnant.jpgTeen Mom 2 star Leah Calvert (formerly known as Leah Messer) is expecting her third child.

This is the 20-year-old reality starlet's first kid with husband Jeremy Calvert; she has two-year-old twins Ali and Aleeah with her first husband Corey Simms, whom she divorced in 2011.

"Jeremy and I are excited to be adding a new addition to our family," Calvert said in a statement. "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. 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."

The third season of Teen Mom 2 is set to premiere November 12 on MTV ... talk about good timing!