Machine Gun Kelly rocks out to own song with Megan Fox after ex Brian Austin Green trolls actress with shady tweet

MACHINE Gun Kelly posted a video of himself rocking out to his song Concert for Aliens with Megan Fox after the actress' ex, Brian Austin Green, trolled her earlier this week.

headbangs and sings some of the song's lyrics while girlfriend smiles in the background.

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He captioned the video: "who’s coming to the Concert for Aliens??"

Earlier this week after she described her new boyfriend as an "achingly beautiful boy" and posed for a loved-up selfie online.

In response, posted pictures of his four children, Kassius Lijah Marcil-Green, 18, who he shares with actress Vanessa Marcil, as well as those he shares with Megan, Noah Shannon Green, 7, Bodhi Ransom Green, 6, and Journey River Green, 4.

He captioned his  post: "Achingly beautiful boys…… My heart is yours."

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Brian's shady tweet comes after he spoke to the with Dax Holt and Adam Glyn and said he typically tries to disregard Megan and Machine Gun Kelly's social media pics.

He shared: ";You can if you ignore it and avoid it which is what I try and do.

"I try to no read anything or look at anything and not involve myself in it. Just keep my head down and do what I do and focus on the kids."

He added he wishes her "the absolute best in everything" and that he wants her "to be completely happy, for her, for the kids."

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He continued: "That’s super important. No one wants to be around somebody that’s unhappy, nothing good comes out of that. That’s a terrible situation."

Megan, 34, and Kelly, 30, reportedly got together when they met on the set of new film Midnight In The Switchgrass.

later wrote on Instagram: "I’m calling you girlfriend, what the f**k. Life imitated art on that one."

More recently, Megan admitted she felt an immediate connection with her co-star, telling Lala Kent and Randall Emmett's podcast : "I knew right away that he was what I call a ."

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Brian Austin Green , after ten years of marriage.

Brian has been spotted with several ladies including model , 38, and reality star .