When Briana DeJesus joined the Teen Mom 2 cast in 2017, she was not welcomed with open arms. In fact, she quickly became persona non grata at her first get-together with the cast - with one exception. Jenelle Evans, Briana said, “is the only one who was acting like her s--t ain’t stink. Plus she was the only one who wasn’t acting fake and choosing sides.” Leah Messer’s response was to “pay no attention to those who try to bring you down … they’re just envious of where you are and how well you’re doing.” As we'll get to in a bit, relations haven't exactly gotten more amicable since.

Maci Bookout and Taylor McKinney's relationship has produced three kids, and they seem very happily married ... most of the time. Like, 85 percent of the time. Bookout alarmed fans with the confession a few years ago that revealed some trouble in paradise: “Eighty-five percent of the time we’re good to go … Fifteen percent is hell. All of our stress and emotions, we take out on each other. When the cameras leave, we’ll drink and freak out. It’s always literally the smallest things. It’s such small stuff but it blows up. It’s not going to go away.” Yikes ... but at least they've had plenty of time to work on things?

So Jenelle has this weird thing about Chelsea -- she accused her of copying her because she made a website for herself after she'd already made her own, because making a website is something totally special and unique. She also kind of accused Chelsea of copying her when she gave birth to Watson the day after Jenelle gave birth to Ensley, which is just wild. On another occasion, Jenelle went off about Chelsea ignoring her older daughter, Aubree, after having Watson, insinuating that she's a bad mother. Chelsea liked a tweet from someone who called Jenelle "pathetic" for bringing up Aubree, which is pretty much the most she's ever participated in this feud.

This one is pretty weird -- one time Babs "jokingly" threatening to "kill Kail" during an Instagram Live session with Jenelle. Lowry was understandably not amused and threatened to quit the show over Barbara's threats. That didn't happen, of course, and it's no longer an issue since Jenelle and her family are no longer on the show, but how bizarre, right?

Brooke Wehr was never a Teen Mom 2 cast member, but due to her mercurial relationship with Jeremy Calvert, her impact was felt just the same. A few years ago, the couple's engagement ended after Brooke accused Jeremy of cheating on her with multiple women, one being a Teen Mom 2 producer, another being her best friend, and a third possibly being his ex-wife Leah Messer. Brooke even shared a screen shot of a text message conversation between Jeremy and the best friend as proof, while Calvert responded in a drunken stupor that yes, maybe he did sleep with Brooke's best friend, but ... only because Wehr slept with some other guy first. Or, as he put it, Brooke was "f-cking his brains out, every day," and he was single, so "my dick was happy to do whatever the f-ck it wanted to do, and it did." Shocking that these two didn't work out ... but neither party was completely off base with their allegations. Just saying. Jeremy and Leah did hook up.

Briana hooked up with Luis in a bathroom while she was drunk, and she got pregnant. They tried to make a relationship work, but he cheated on her and was generally just not great. He's never really been around for their daughter, Stella, but he did come back around a couple of years ago for a bit. Briana even decided to give him another shot -- except this time, she got the clap. So yeah, they're not on the best terms.