The 55-year-old took a major dig at the Duchess of Sussex in the new trailer for Australia's Big Brother VIP.
The celebrity packed reality series introduced its new stars this past Sunday, and in the clip introducing Markle, he announced, "I'm Meghan Markle's brother. I'm the biggest brother of them all."
He didn't hold back, recounting a conversation that he had about his estranged younger sister, saying "I told Prince Harry, I think she's going to ruin your life. She's very shallow."
Much like their father, Thomas, the actress' half brother has no relationship with her. He was not invited to the wedding in May 2018, and in fact, he has not seen his sister in seven years. That hasn't stopped the window fitter from trashing her to anyone who will listen.
Other creative adjectives he has used to describe the Duchess are, "phony", "jaded", and "conceited." It would be fair to assume that Markle Jr., is just getting warmed up as long as he stays a resident of the Big Brother house.
Meanwhile, other American celebrities to appear on the Australian reality series are Omarosa Manigault Newman, 47, who took a few jabs at her former boss, Donald Trump.
The fired Celebrity Apprentice star says of the former President, "You know how they say power corrupts a person? Donald Trump was drunk and mad on power." You can bet Trump won't be able to resist firing back a few jabs of his own before she's booted from the house.
Another American celebrity to be starring on the reality show is none other than Caitlyn Jenner, 71. The former KUWTK star says on the shows introduction clip, "I won Olympic gold, I grew up with the Kardashian group. I can handle anything!"
The Big Brother VIP cast also includes Australian famous faces, Jessika Power, Ellie Gonsalves, Imogen Anthony, Josh Carroll, Matt Cooper, Dayne Beams, Luke Toki, and Bernard Curry.