Brian Austin Green has joked after his estranged wife Megan Fox posted on Instagram lovey-dovey photo with her new lover, rapper Machine Gun Kelly.

A source revealed to People magazine that the former Beverly Hills, 90210 actor is actually not happy with her new romantic relationship.

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“Brian is annoyed that she is so focused on her relationship with Machine Gun Kelly,” the source stated. “He doesn’t understand the need to post social media pictures with silly captions to proclaim her love for him. They aren’t even divorced yet. It definitely annoys Brian.”

More dramatic, the Brian also shared how shocked he was by how fast his wife fell in love with Machine Gun Kelly just after they had a split.

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The couple was reported to go separate ways last year as the source added: “It stings a bit too that Megan moved on so quickly.”

Green claimed to not recognize the actress these days as she seems to “transform” into a totally different person when appearing at public places during her gathering with her new lover, as well as how she is more “public” now compared to the past.

“Megan was always very private, so Brian just doesn’t get what changed,” the source said.

Since the new couple reported to stick to each other, they have been seen enjoying their love ship on dates and the social media as well.

>>> See more: Megan Fox And Machine Gun Kelly Caught Dating At Luxury Resort

She recently posted a photo of Machine on Instagram and called him “an achingly Beautiful Boy.”

“My heart is yours”, she added.

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Green shared a photo of his four sons later then and captioned: “Achingly beautiful boys….. my heart is yours.” as a strike back reply.

Brian Austin Green and Megan Fox have three children together Bodhi, 6, Journey, 4, and Noah, 7, and his own son Kassius, 18, from his previous relationship with actress Vanessa Marcil.

Also, Brian disclaimed in the post that he didn’t want Megan and Kelly to be considered as “villains” in this and he was a “victim”.