One of the Teen Mom's is expecting again!  This time it is 20-year-old Leah Calvert and her 23-year-old husband Jeremy.  They have announced that they're expecting their first child together.  Leah already has twins with her ex-husband, Corey Simms, so this will be her third child. She tells Us Weekly, "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."