Like all the girls on 16 and Pregnant, Katie Yeager didn't expect to be a mom before her high school graduation. "I never planned on having kids, even when I was older," Katie tells Star. "Now I try not to plan too far ahead because you never know what's going to happen tomorrow."

It's a familiar refrain in a 12-episode season that follows a new group of girls dealing with everything from drug-addicted parents to the prospect of adoption while preparing to give birth.

For Katie, a model student with dreams of a master's degree, everything is about to change. Though she does graduate from high school, Katie must abandon her plans to go to college in Denver, and a fight about whether she and her boyfriend, Joey, can afford their own place jeopardizes their relationship.

Life only gets more hectic after baby Molli is born. "Sometimes I feel like I'm losing it," Katie admits. "One time I was in the store and baby-talked to the clerk. I felt like such a dork!"