Don't mess with Briana DeJesus, cause she'll expose you!

The new Teen Mom 2 cast member just welcomed her second daughter — a baby girl named Stella — on Sunday, July 2 and she still somehow found time to take a jab at her former Teen Mom 3 co-star Mackenzie McKee before going into labor.

https://www.instagram.com/p/BUYqlbVjZvz/

MORE: Get to Know Briana DeJesus — the New Cast Member of 'Teen Mom 2'

Bri took a screenshot of a tweet that called for a fan protest to get her off of the upcoming season of Teen Mom 2 after MTV announced that she will be joining Jenelle Evans, Chelsea Houska, Kailyn Lowry, and Leah Messer as the fifth mom on the show — and Mac actually "liked" the tweet, which means she agreed that Bri should get kicked off.

"Lmao [Mackenzie] why?" the 23-year-old captioned the screenshot, calling out her former co-star.

https://twitter.com/_BrianaDejesus/status/881145944787619840

Just a few hours later, the mom-of-three seemed to respond to the tweet and she shared a series of tweets where she complained that someone on her feed only follows her just to spread "hate," and she had to block that person.

MORE: There Is So Much Drama Going on in the New 'Teen Mom 2' Trailer and We Are So Here for It!

"I don't hate anyone. I've always loved this person. But I can promise she hates me," the 22-year-old wrote and said that she blocked the person in question.

Mac and Bri starred on the first and only season of MTV's Teen Mom 3 together, and the fitness model revealed that MTV had previously interviewed both her and Bri before making the decision to add a fifth Teen Mom 2 cast member. But the producers ultimately went with Briana, and Mackenzie threw some subtle shade when she revealed why she thinks they chose Bri over her.

MORE: 'Teen Mom 3' Alum Mackenzie McKee's Family Just Got a Little Bigger!

“I hope MTV didn’t choose her over me because I am married and have three kids with the same guy,” she revealed to Radar Online back in March.“The story on different baby daddies is what people are interested in.”

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Scroll through the gallery below to find out what the rest of the girls from Teen Mom 3 are up to now