Hilary Duff, Kristin Cavallari, Adele and more stars who were under 30 when they welcomed their first child
Jamie Lynn Spears
The younger sister of Britney Spears announced she and boyfriend Casey Aldridge were expecting their first child when she was just 16 years old. The two became engaged and Spears gave birth to daughter Maddie in June 2008. But the young couple called off their engagement in March 2009. "I was young. I was in love. I was like every other teenager, except I had this last name," Spears told Glamour magazine in 2012. "And I made a decision that is forever my decision."