After Brian Austin Green posted an Instagram Stories calling out his pregnant ex-wife Megan Fox’s former fiancé Machine Gun Kelly, the Beverly Hills, 90210 star revealed what motivated him to do so.

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 ...

Megan Fox is known to switch up her hair ... celebrity makeup artist Jenna Kristina revealed her trick for ensuring Fox had the glowiest skin at the GQ Men of the Year event in Los Angeles.

"That's not something that I normally do, but it just ... really got under my skin," Green tells PEOPLE of his recent ...