Chelsea, Kailyn, Jenelle and Leah have closed the chapter on yet another dramatic Teen Mom 2 season -- and while all four women have different narratives, the foursome endured some truly unforgettable scenes during this installment.

From a surprising engagement to a legally altered co-parenting agreement, take a look at the most memorable moments from the past 12 episodes and share your thoughts about the mentioned incidents in the comments. And be sure to catch Part 1 of the reunion next Monday at a new time of 9/8c.

Chelsea

The esthetician found her Prince Charming -- and said "yes" to a lifelong commitment with Cole! And even though the big ask was not captured on-camera, the newly engaged couple celebrated the milestone occasion with Chelsea's family post-proposal (the happy memory is above).

Leah

The West Virginia native struggled with the outcome of her custody case involving twins Ali and Aleeah -- Leah's sitdown with her lawyer can be reviewed above. But viewers watched Leah adapt to this new co-parenting agreement and thrive with the new schedule.

Jenelle

Jenelle faced legal unknowns and health issues -- but the South Carolina resident had a new man by her side to help her through these stormy times. And, shortly after the two started dating, Jenelle introduced David to her mother Barbara (relive it above).

Kailyn

The mother of two learned the her husband Javi would be deployed for a lengthy period -- and when Javi departed for his overseas duties, the goodbye was understandably emotional (as seen above).