Brian Austin Green appeared to mock ex Megan Fox's Instagram tribute for new boyfriend Machine Gun Kelly

• Brian Austin Green seemingly mocked his ex Megan Fox's Instagram tribute to boyfriend Machine Gun Kelly on Wednesday.
• Fox posted a black-and-white selfie with Kelly and captioned it, "Achingly Beautiful Boy... My heart is yours."
• Hours later, Green shared a series of photos of his four sons — three of which he shares with Fox.
• He wrote: "Achingly beautiful boys...... My heart is yours."

Brian Austin Green had a shady response to his ex Megan Fox's Instagram tribute to her new boyfriend Machine Gun Kelly.

On Wednesday, the "Jennifer's Body" actress posted a black-and-white selfie with the rapper, whose real name is Colson Baker.

She captioned the photo, "Achingly Beautiful Boy... My heart is yours."

Green, who was married to Fox for 10 years before they separated at the end of 2019, appeared to mock his ex's tribute hours after she posted it.

He shared a photo of his 18-year-old son Kassius, whom he shares with ex Vanessa Marcil, along with pictures of Noah, 7, Bodhi, 6, and Journey, 4, whom he shares with Fox.

"Achingly beautiful boys...... My heart is yours," he captioned the photos, which was a direct nod to the actress' Instagram post.

Fox and Kelly met while filming "Midnight in the Switchgrass" in Puerto Rico in mid-March before production was shut down due to COVID-19. Once they returned home to Los Angeles, they were spotted together.

Around the same time that Fox and Kelly were first seen together, reports surfaced that Fox and Green were isolating separately during the pandemic. Green was also spotted without his wedding ring, which fueled rumors that the married couple had called it quits.

On Fox's 34th birthday, Green posted a cryptic message about a butterfly, which seemed to be a metaphor for Fox, on Instagram.

"Eventually butterflies get bored sitting on a flower for too long. They start feeling smothered. It's a great big world and they want to experience it," he wrote.

Two days later, Green confirmed that he and Fox had been separated since the end of 2019 on an episode of his podcast "...With Brian Austin Green."

"I will always love her, and I know she'll always love me and I know as far as a family what we have built is really cool and it's really special," he said.

The actor also addressed the speculations that Fox had moved on with Kelly, who Green said he hadn't met.

"Megan and I talked about him and they're friends at this point, and from what she's expressed, he's a really just nice, genuine guy. I trust her judgment. She's always had really good judgment," he said.

Kelly and Fox confirmed their relationship in June, and they've since returned to Puerto Rico to continue filming "Midnight in the Switchgrass."

On Monday, Green opened up about learning that Fox was dating Kelly during an episode of the "Hollywood Raw" podcast.

"I found out in my own way. And that's as much detail as I'll give you on that one. I didn't read about it or anything like that," he said.