Megan Fox's ex-husband Brian Austin Green has shared a scathing message for Machine Gun Kelly after finding out the couple has split.
News that Megan, 38, and MGK, 34, had split came earlier this week, with sources stating that the on-off couple had called it quits at Thanksgiving, just two weeks after announcing their pregnancy.
The former couple are expecting their first baby together, due in March 2025, which will be MGK's second child and Megan's fourth overall.
Sources had claimed to Page Six that Megan allegedly found something "upsetting" on MGK's phone during a Thanksgiving trip to Vail, Colorado, and asked him to leave early, with insiders claiming the pair are done for good this time.
One person who seemed to miss the news was Brian, 51, who shared a scathing message to MGK when asked about his thoughts.
Brian, who was together with Megan for 16 years and married for 10 years, was stopped by a TMZ reporter while grabbing coffee in Los Angeles this week.
When asked what he thought about Megan's split, he told the outlet: "I didn’t even know."
The Beverly Hills, 90210 star, who is the father of Megan's three sons, was seen looking frustrated and audibly sighing when told that Megan allegedly found something on MGK's phone that upset her.
Brian then asked: "How old is he? Do you know? He’s in his 30s, isn’t he? Christ."
He then added: "But in your 30s, like, f**k. Grow up. Like, she’s pregnant."
When asked if he was worried about Megan, Brian said he just "wants the best" for her and her unborn child, as well as the three boys they share together - Noah, 12, Bodhi, 10, and Journey, eight.
He added: "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."
Brian also told the reporter: "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."
He added that while he doesn't know "the facts" about his ex's split, he labeled the situation "tragic".
A source told Page Six that Megan "became suspicious" and later "found text messages involving other women and decided she was done."
The insider told the outlet that the 38-year-old "had trust issues" with the musician "because of past behavior" throughout their relationship, and while she'd hoped to "rebuild her trust with Colson [Baker, MGK's real name] and was excited to grow their family together," the recent discovery changed her mind.
Megan had announced her pregnancy on November 11, sharing a photo of her kneeling alone while covered in black sludge.
She captioned it: "nothing is ever really lost. welcome back," alluding to the miscarriage the pair had previously had.
Megan and MGK are yet to publicly address the breakup themselves.