Pax, the son of Angelina Jolie and Brad Pitt, has blasted his father, calling him a “world-class a*****e”.

In a photo published on Instastory, the 19-year-old “congratulated” the actor on Father’s Day, by insulting him.

“Happy Father’s Day to this world class a*****e. You, time and time again, prove yourself to be a terrible and despicable person. You have no consideration or empathy  toward your 4 youngest children, who tremble in fear when in your presence. You will never understand the damage you have done to my family because you are incapable of doing so.”

He continued: “You have made the lives of those closest to me a constant hell. You may tell yourself and the world whatever you want, but the truth will come to light someday. So, Happy Father`s Day, you f****g awful human being!!!!”.

Pax’s Instagram account was private and the post is believed to have been screenshotted by the 19-year-old’s friends.

It was also thought that the account did not belong to the boy, but the Daily Mail later confirmed that it was his personal account, which he used for close friends and family.