Since getting pregnant with twins as a teenager, Leah Calvert has faced a lifetime worth of parenting struggles and relationship disappointments, but over three years later, it looks as if the newlywed is well on her way to a happy ending. Calvert gave birth to her third child -- her first with second husband Jeremy -- February 4, and she's never seemed in better spirits.

The "Teen Mom 2" cast member poses proudly with her family of five in the latest issue of Us Weekly, and gushes about her darling baby girl, Addalynne Faith, who was born via emergency C-section five weeks ahead of schedule. "We were amazed -- she was just so beautiful," the young mother tells the mag of her 5-pound daughter's arrival. "She reached out and grabbed Jeremy's little finger. It was very emotional."

After suffering a miscarriage last year, Leah and Jeremy consider Addalynne a gift. "It was really hard for us to lose our first child," she tells the mag. "So she's very, very spoiled." (Does that mean her big sis now has a pedicure partner?)

As originally documented in 2010 on MTV's "16 and Pregnant," Leah has twins Ali and Aleeah from a previous relationship with now ex-husband Corey Simms. When she first announced she was expecting back in October, Leah dismissed public skepticism that having another baby was too much to take on. "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," she told Us Weekly. Despite the many challenges facing young parents today, Leah said she felt "incredibly blessed."

Relive Jeremy's marriage proposal in the clip below, plus stay tuned for more updates on Baby Addalynne, including exclusive video from our recent visit to Leah's home in West Virginia.

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Photo courtesy of Us Weekly