United Kingdom, Feb. 6 -- Brian Austin Green doesn't regret "speaking his mind" about Machine Gun Kelly.

The 51-year-old actor was previously married to Megan Fox - who revealed that she is expecting a baby with the 'Bloody Valentine' hitmaker shortly before they called time on their relationship - and subsequently hit out at him on social media, where he accused him of not telling the truth.

He told People: "That's not something that I normally do, but it just really at the time, really got under my skin to read about his sort of take on it.

"So I spoke my mind, but then I've since come to terms with the fact that I won't do that anymore. I'm going to shut up and just sit back."

Just days ago, the former '90210' star took to |nstagra...