"That's not something that I normally do, but it just ... really got under my skin," Green tells PEOPLE of his recent Instagram Stories post about Kelly trying to 'drag other people'

Brian Austin Green called out the rapper on his Instagram Stories, telling him to stop trying to "drag other people," alongside an article about Kelly's relationship with Megan Fox, now he is revealing why he got involved.

Brian Austin Green publicly shared a message for ex-wife Megan Fox’s ex-fiance, Machine Gun Kelly, with whom she’s expecting a baby

The "Beverly Hills, 90210" actor said his recent out-of-character diss of his ex's ex are the last you'll hear from him on the topic.

Brian Austin Green's marriage to Megan Fox might not have made it, but he will always have her back. The Beverly Hills, 90210actor explained why he took the time to publicly call out Fox's ex Machine Gun Kelly — whom she's currently expecting a baby with — via his Instagram Story during a recent appearance at the Hollywood Virgin Los Angeles