Meghan Markle's brother Thomas Markle Jr savagely insults her in Big Brother VIP trailer

Meghan Markle's older half-brother Thomas Markle Jr has dubbed the Duchess of Sussex "shallow" and claimed he warned Prince Harry about her in a trailer for Big Brother VIP

Thomas, named after his father, whom Meghan infamously fell out with around the time of the royal wedding, is part of the cast of the Australian reality television series and didn't hold back when it came to his sister. 

"I told Prince Harry, 'I think she's going to ruin your life'," he claimed in the promotional clip. 

"She's very shallow," he added. 

Thomas called himself "the biggest brother of them all" despite the fact he was not invited to Meghan and Harry's wedding and reportedly hasn't seen his half-sister in at least seven years. 

In her bombshell interview with Oprah Winfrey, Meghan claimed she "really didn't know" her half-brother and half-sister Samantha Markle, who has also been vocal in her criticism of the Duchess in the press.

"I grew up as an only child, which everyone who grew up around me knows, and I wished I had siblings. I would have loved to have siblings," Meghan insisted. 

"I mean, the last time I saw [Samantha] must have been at least 18, 19 years ago. And before that, ten years before that," she said. 

Meghan also claimed Samantha only changed her last name to Markle after the former Suits star began dating Prince Harry. 

"So I think that says enough," Meghan added. 

The Big Brother VIP cast also includes Caitlyn Jenner, whose arrival in Australia prompted outrage due to strict caps on arrival numbers as Sydney was gripped by the latest COVID-19 outbreak. 

Meanwhile, controversial UK commentator Katie Hopkins, a fellow Trump supporter who was also reportedly set to star in Big Brother VIP, was deported from Australia after she boasted about breaching the country's hotel quarantine rules on social media.