Megan Fox's ex Brian Austin Green tells Machine Gun Kelly to 'grow up'

Brian Austin Green is slamming his ex-wife Megan Fox's boyfriend Machine Gun Kelly amid their rumored split.

The "Beverly Hills, 90210" alum told a TMZ paparazzo he "didn't even know" that his "Transformers" actress ex split with her longtime on-again, off-again boyfriend. Green slammed the "Lonely Road" crooner after TMZ told him about rumors surrounding the pair.

"How old is he? … He's in his 30s, isn't he?" he quipped, before telling MGK "to grow up" because "she's pregnant," in reference to Fox's pregnancy. He continued: "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."

Green noted he didn't "know the facts," but said: "if that's the case, that's a tragic situation, and I wouldn't wish that on anybody."

Megan Fox and Machine Gun Kelly are expecting their first child together

Fox and her "twin flame" are rumored to have lost their spark again. They first started dating soon after Fox appeared in the music video for Kelly's single "Bloody Valentine" in May 2020, the same month she filed for divorce from Green.

Fox and Green met in 2004 when Green, with whom she shares three children, guest-starred on the series "Hope & Faith" when Fox was 18 and he was 30. They became engaged in 2006 but broke it off before eventually marrying in June 2010.

Rumors surfaced Tuesday that Fox and MGK, born Colson Baker, split nearly one month to the day after they announced their pregnancy on Nov. 11. USA TODAY has reached out to reps for Fox and MGK for comment.

In an Instagram post Nov. 11, Fox revealed she is pregnant with her fourth child and her first baby with MGK.

The "Jennifer's Body" star shared a photo of herself naked, cradling her belly, covered in what appeared to be black paint. A second photo showed her holding a pregnancy test with a positive result. Fox tagged Kelly in the post.

"Nothing is ever really lost," she captioned the post. "Welcome back." The news came about a year after Fox shared that the duo previously suffered a pregnancy loss, detailing the experience on "Good Morning America" at the time.

"I've never been through anything like that before in my life," she told "GMA." "I have three kids. So it was very difficult for both of us, and it sent us on a very wild journey together."

Contributing: Brendan Morrow, Cydney Henderson, Hannah Yasharoff

This article originally appeared on USA TODAY: Megan Fox's ex-husband Brian Austin Green slams Machine Gun Kelly