Kailyn Lowry Pregnant: 'Teen Mom 2' Star Expecting Second Child

03/26/2013 11:29 am ET

Kailyn Lowry is pregnant again.

The "Teen Mom 2" star, 21, is expecting her second child -- her first with husband Javi Marroquin, 20, his sister Lida Marroquin reveals to In Touch Weekly. The newlyweds recently shared the news with their families.

“They’re overjoyed!" Lidia tells In Touch. "When Kailyn told Javi, he cried.”

Kailyn, who has a 3-year-old son, Isaac, with her ex-boyfriend Jo Rivera, married Javi in September, before he left for Air Force training in Texas. According to a friend, she conceived the baby during his winter visit, but the couple wasn't necessarily trying to add to their brood.

"They weren’t preventing it, either,” a friend of Kailyn's admits to In Touch. “They’re nervous about the transition to two children, but are so excited!”

And although Javi might be overseas when Kailyn gives birth, Lidia says her family is only minutes away and "happy to help her."

As for all those skeptics out there, the "Teen Mom 2" star's pal says Kailyn is nothing like the teenager she used to be. “She’ll forever be 16 in America’s eyes,” her friend explains, “But she’s not a little girl anymore -- she really feels like her life is just beginning.”

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