Tensions are hot between Megan Fox’s ex-husband, Brian Austin Green, and ex-fiancé Machine Gun Kelly! The 90210 actor shared an alleged screenshot of a Direct Message MGK sent to him, who told him to back off about the arrival of the musician’s unborn child with Megan.

“Stop asking when our child is gonna born. You the FEDS,” MGK, 34, wrote to Brian, 51, in an alleged message via Instagram. “Quit calling TMZ and focus on that apology you owe me for speaking on my name in public.”

The “Emo Girl” artist concluded his apparent message, “You chose the wrong one to f–k with mr child actor. Go back to cereal commercials.”

Brian, who has since deleted the Thursday, March 27, Instagram post, wrote alongside the screenshot, “I didn’t know ‘child actor’ was something bad. Leo [DiCaprio], careful. He may be coming for you next.”

Megan, 38, and Brian ended their 10-year marriage in 2020 and finalized their divorce the following year. They share kids Noah Green, 12, Bodhi Green, 11, and Journey Green, 8. Despite their divorce, the pair has maintained a close coparenting relationship.

The Jennifer’s Body star began dating MGK shortly after her split from Brian in 2020. Amid their on-again, off-again relationship, Megan announced her pregnancy with baby No. 4, her first with MGK, in November 2024. Despite the happy news, the Transformers starlet and MGK called it quits the following month after he was allegedly unfaithful during their relationship.

“Megan and MGK have broken up several times since the pregnancy was announced,” a source told Us Weekly at the time. “This was just one of the bigger ones that people have heard about.”

The insider continued, “Their relationship is so full of passion and that leads them to get back together over and over, but also to fight in the most toxic of ways. Their fights have gotten less intense now that MGK is sober, but they still have such a hard time having a stable relationship with each other.”

Brian, who is currently engaged to fiancée Sharna Burgess, reacted to Megan and MGK’s split and quickly came to his ex’s defense.

“How old is he? Do you know? He’s in his 30s. Nice … In your 30s, like — I don’t know. Grow up. She’s pregnant,” Brian told TMZ on December 10, 2025. “I just want the best for her, I want the best for the baby, I want the best for our kids. That’s a shame. That’s a shame. I’m heartbroken about it because I know she’s been so excited and the kids are so excited for life and the change and all of that.”

Both Megan and Brian have opened up about their coparenting dynamic and base their mutual respect on their kids.

“I think it’s really important when people separate to never ever disparage the other parent or even in a passive aggressive way, make remarks,” the This Is 40 actress said during a November 2023 appearance on The Drew Barrymore Show. “I don’t let anything in my energy like that when I’m around my kids because if I don’t accept and love their father I’m rejecting a part of them because he’s a part of who they are always.”