We don't know much about these ladies yet — aside from the fact that they popped out babies at the tender age of 16 — but we're about to learn a whole lot more!
Mackenzie's a country gal from Oklahoma with a son named Ganoon, Katie's going to school to provide a better life for baby Molli, Briana's living in Orlando, Fla. with her daughter Nova, and Alex is a dancer raising a little one named Arabella.
No word yet on a premiere date for MTV's third Teen Mom installment, but we'll keep you posted as the news comes in. In the meantime, tell us your thoughts on Teen Mom 3. Will you watch?