'Teen Mom 2' Tragedy: Kailyn Lowry Suffers Miscarriage, While Leah Messer Loses Custody Of Twins

The new season of Teen Mom 2 is expected to be the most heartbreaking yet. In the first trailer for season seven,Kailyn Lowry, Leah Messer, Jenelle Evans and Chelsea Houska are brought to tears during another drama-packed year.

A grief-stricken Lowry, 23, not only reveals her airman husband Javi Marroquin is being deployed, but she also admits to suffering a miscarriage.

"Knowing that he's leaving and then on top of it I had a miscarriage," Lowry said, as her husband responded, "You know how much I wanted that baby."

Messer has a loss of her own, as her ex-husband Corey Simms receives "primary, legal and custodial" custody of their twin daughters Ali and Aleeah.

"Corey is trying to take our kids from me," Messer, 23, sobs. "What's life without your kids?"

Although Evans seems to be in a healthy relationship with her new boyfriend David Eason, her mother Barbara Evans doesn't approve.

"This is my daughter, I'm not leaving," she says, as Eason slams a door in her face. "You are the worst boyfriend she's ever had!"

Her ex-fiancé Nathan Griffith also can't stand Eason. He shares how he "just got out of prison for domestic violence."

Eason responds to Griffith's claims by vowing to "snap his f**king neck."

As for Houska, she celebrates her engagement to fiancé Cole DeBoer. But her baby daddy Adam Lind threatening to get 50/50 custody of their daughter Aubree may cause trouble in paradise!

Watch the video below for more bombshells. Season seven of Teen Mom 2 premieres March 21 at 10/9c on MTV.