Watch Teen Mom 2 premiere online: Drama ahead for Chelsea, Jenelle, Kailyn and Leah in season 6

Teen Mom 2 will see Kailyn Lowry, Chelsea Houska, Jenelle Evans and Leah Calvert resume their parenting journey in the highly anticipated sixth season premiere on 9 July at 10pm ET/PT.

Click here to watch Teen Mom 2 episodes online.

The premiere episode is titled Keep It Moving, and the official synopsis reads as follows:

A new promo shows Leah Calvert and ex-husband Corey Simms finally coming to an agreement after months of fighting for custody of their five-year-old twins in court.

"Even though I'm annoyed that I have to take a drug test, I'm relieved that our custody hearing is over. I'm hoping we can move past this for our girls' sake," Calvert says in a preview clip.

Simms is seeking full custody of their daughters Ali and Aleeah, on the grounds that Calvert is an "unfit mother" after she repeatedly dropped the kids late at school.

"Like I told you from day one, what I was doing was not a personal attack towards you," Simms explained to Calvert. "It might have seemed like that, but what I was seeing I just didn't agree with. I didn't like the tardies because next year they aren't going to like tardies in kindergarden."

"I can't say that I don't have hard feelings, because I do," Calvert says. "Being called an incompetent mother and this and that was really hurtful."

However, despite their rocky past, the focus for Calvert and Simms is still on their children.

"It feels like we both have little chips on our shoulders and we can't stand each other, because that's how I feel, I'm sure that you feel the same," says Simms. "But I just want us to do the best for them."

Meanwhile, mother-of-two Jenelle is having trouble getting along with her own mother Barbara. When Barbara brings up Jace and Kaiser's childcare topic during her vacation with her beau Nathan, Jenelle becomes frustrated.

On the other hand, newly enrolled college student Kailyn is making new acquaintances at school, but a man's texts causes friction between her and her jealous husband Javi.

As for Chelsea Houska, she will be seen with her new boyfriend Cole DeBoer, but her drama is mostly focused around Adam Lind this season and the fact that he's requesting 50/50 custody of their daughter, Aubree.