'Teen Mom 2' Leah Messer Fights Corey At Reunion [WATCH]: Miranda & Leah's Mom Get Involved!

Teen Mom 2 star Leah Messer's nasty feud with ex-husband Corey Simms just got even worse after the former MTV couple duked it out on the reunion special. Things got so bad that Leah had to create a "safe word" so that she wouldn't fall apart on the stage ever since coming home from a stint in rehab. Even Leah's mom Dawn Spears and Corey's wife Miranda Simms got involved.

In a sneak peek video, Corey starts telling his ex that his current wife Miranda gave him "a backbone to stand up to your bulls**t." Their fight got even worse when Leah asked Corey where he was in his first two months of marriage to Miranda. As MStarz reported, the pair allegedly had a sexual affair with each other while both were married to other people. Obviously, the MTV mom was alluding to their cheating rendezvous.

At the end of the clip, Leah calls out the word "monkey" so Corey would stop coming after her with things she didn't want to talk about. When the West Virginia dad didn't hear Leah say her "safe word" her mother Dawn called it out from the audience.

"[Dawn] claims that Leah almost died from stress and anxiety before she went to treatment," a source told The Ashley Reality Roundup. "She said Leah's blood pressure was sky-high. She didn't want Leah to go to the reunion, but she has to due to her contract."

Check out the intense fight here:

Not only was their drama on stage, but the reality star's mother was also wreaking havoc behind-the-scenes. Let's just say there was no love lost between Dawn and Miranda after the reunion was over.

"Afterward, Corey and Miranda had a good giggle at Leah's safe word and Dawn overheard them laughing about it and, of course, came unglued," The Ashley reported. "... Dawn was telling people how much she and Leah hate Miranda."

Whose side are you on: Corey and Miranda or Leah and Dawn?