Meet the three families of Unexpected as they face the challenges of teen pregnancy and parenthood.

Lexus is fifteen and about to be a mom.

A teen mom herself, Kelsey never imagined her daughter would follow in her footsteps. Now she's about to become a grandmother.

Lilly vents to her mom how lonely she feels now that she's pregnant and her friends have moved on.

McKayla's birth mom surprises everyone when she shows up to prom pictures.

McKayla and her Grandma try to find a prom dress at 32 weeks pregnant.

McKayla shares the details of how she grew up and what it's like being pregnant at the same time as her mom.

Lilly becomes upset when James doesn't take the Lamaze Class seriously.

After a false labor scare, Kelsey realizes Lexus and her boyfriend are not prepared to be parents.

Shannon (McKayla's mom) tries to resolve her issues with Shelley (Caelan's mom) over the phone.

Surrounded by her family, Lexus deals with labor pains in the hospital.

Tension continues between Shannon and Shelley at McKayla's baby shower.

Disappointed by James' behavior, Lilly has dinner with her family to lift her spirits.

Lexus and Shayden talk about the responsibility of parenting.

James gives Lilly a ring.

McKayla en route to the hospital with her grandparents.

Lilly and Kim discuss the baby's last name.

James gives Lilly a ring.

Lexus talks about her lack of friends, being lonely and fighting with Shayden.

James gets an education about birth and babies from his mom and sister.

McKayla en route to the hospital with her grandparents.

McKayla starts to feel protective of her new baby now that he is out in the world.

Lilly tries to kick-start her labor by dancing in her living room.

Lexus has a family cookout for her 16th birthday.

McKayla has a dramatic reaction when Shelly and Shannon finally confront each other face-to-face about their feud that unfolded throughout the season.

Meet the three families of Unexpected as they face the challenges of teen pregnancy and parenthood.

Lilly vents to her mom how lonely she feels now that she's pregnant and her friends have moved on.

Lexus is fifteen and about to be a mom.

A teen mom herself, Kelsey never imagined her daughter would follow in her footsteps. Now she's about to become a grandmother.

Despite his differences, Nick is always ready to take on the world.

Nick works with several engineers in trying to drive a car without any limbs. He's not confident it will work.

A look back at some of the cutest Gosselin moments to date