Brian Austin Green appears to shade ex Megan Fox's gushy post about new boyfriend Machine Gun Kelly

Co-parenting during a pandemic with a former partner has got to be challenging.

Brian Austin Green seemed to demonstrate that when he posted an apparent response to his estranged wife, Megan Fox, on Wednesday.

The former Beverly Hills, 90210 star took to Instagram with a series of photos of their children, along with his son from his previous marriage, a few hours after Fox posted a photo with her new boyfriend, Machine Gun Kelly.

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

READ MORE: Megan Fox and Machine Gun Kelly's complete relationship timeline

But what caught the eye of Green's followers was that his Instagram caption was the nearly the same as his ex, "Achingly beautiful boys ... my heart is yours."

Green confirmed his split from Fox last month after nearly a decade together. The actor said Fox first told him she wanted to separate last year.

"She said, 'You know what, I realised while I was out of the country working alone, that I feel more like myself and I liked myself better during that experience. And I think that's something that might be worth trying for me,'" he said on his podcast, ...With Brian Austin Green.

"I was upset about it, but I can't be upset at her and I wasn't upset at her because she didn't ask to feel that way."

READ MORE: Megan Fox and Brian Austin Green's complete relationship timeline

He also said he thought Kelly seemed like a "nice, genuine guy".

Green also recently discussed how they co-parent, saying, "There's no rule book to it. There's no way of doing it right or wrong. We're just learning as we go."