Watch the FIRST Look At The EMOTIONAL 'Teen Mom OG' Season Finale

Tonight is the night!

The Teen Mom OG season finale airs tonight and it's heartbreaking! As seen in the sneak peek clips, Catelynn Lowell shocks her husband when she reveals she's heading back to treatment for the third time, Maci Bookout claims that her first baby daddy, Ryan Edwards, still isn't sober, and Amber Portwood struggles with co-parenting her daughter Leah with her ex, Gary Shirley.

Watch the clip above! Teen Mom OG airs Monday nights at 9pm ET, only on MTV!