Brian Austin Green 'Totally Fine' With Megan Fox, Machine Gun Kelly Getting Serious, Source Says

Brian Austin Green has already moved on from estranged wife Megan Fox and has no problem with her romance with Machine Gun Kelly getting serious, a report said.

In May, Green confirmed that he, 47, and Fox, 34, had already separated before she was spotted with Kelly, 30. Weeks after announcing their split, Fox and the rapper made their romance official. There is no denying that the actress' relationship with her "Midnight in the Switchgrass" co-star is progressing fast, but Green apparently doesn't mind.

"Brian is totally fine about them getting more serious," an unnamed source told Us Weekly. "He is doing his own thing and there’s no animosity."

The insider said that Green is supportive of his estranged wife finding love and happiness, though unlike Fox, the actor is not ready for anything serious at the moment.

"He is pleased that Megan is preoccupied and happy," the source added. "He is socially dating and seeing different girls. He’s not on that same page of being in a serious relationship right now, but he’s totally cool with MGK, no question about it.”

Another unnamed source told Us Weekly last month that Green was no longer devastated over his split from Fox. In fact, the "Terminator" star doesn't care about his estranged wife and Kelly flaunting their relationship in public, per the report.

Green previously discussed Kelly during an Instagram Live back in August in which he said that he has no issues with the rapper.

"I’ve never met him, I have no idea, I’ve never heard anything bad from him or bad from Megan about him," Green said.

"I’ve heard bad stories about him, but I’ve heard bad stories about myself as well and I know that most of those aren’t true," he added. "As of right now, I have no problem with him. I really hope that he and Megan are happy because it’s important that she’s happy and it’s important that everyone is happy.”

But although Green wished his estranged wife well, he raised some eyebrows when he seemingly shaded her on social media after Fox posted a photo on Instagram of her and her new boyfriend posing in front of a mirror.

"Achingly Beautiful Boy... My heart is yours," Fox wrote in the caption.

Just hours later, Green also shared a snap of his four children on Instagram and used her caption.

"Achingly beautiful boys...... My heart is yours," he wrote in his post.