THOMAS Markle Jr. branded estranged half-sister Meghan "shallow" as he entered the Celebrity Big Brother house in Australia.
The 55-year-old joins TV star Caitlyn Jenner and former Trump aide Omarosa in Sydney for the reality show.
Ahead of entering the star-studded house, he told viewers: “I’m Meghan Markle’s brother. I’m the biggest brother of them all.
“I told Prince Harry, I think she’s going to ruin your life. She’s very shallow.”
Thomas previously said he was “baffled” about not being invited to Meghan’s nuptials in 2018, reports.
He added: “Here is a person knowing the position she’s in and knowing the scrutiny she’s under and yet she has forgotten her flesh and blood.”
Meghan is reportedly bracing for fresh embarrassment and controversy as Thomas may reveal more revelations on the show, which airs later this year.
The window fitter has previously hit out at Meghan in the press, dubbing her a "phony", a bully, and a "jaded, shallow, conceited woman."
Thomas Jr also criticised Meghan for "cutting off" their dad after he admitted he was paid to pose for paparazzi pictures sold to news outlets worldwide.
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Thomas Sr, 76, was meant to walk the Duchess down the aisle.
He wanted to attend the ceremony but conceded he couldn't make it due to heart surgery.
Thomas Jr's appearance in the Big Brother house comes as Meghan reportedly ignored her dad after he sent her flowers for her 40th birthday.
He reportedly sent a dozen red roses with two yellow flowers in the middle, which Thomas claimed symbolised the Duchess’ two kids Archie and Lilibet.
Meghan's estranged dad told he wanted to incorporate his grandkids in the arrangement because he wants to be a part of their lives.
'JADED AND SHALLOW'
And he sent them with a small note seen by The Sun, which read: "Happy Birthday to my bean with much love and a brighter future. Dad."
But Thomas told TMZ he hasn't heard from his daughter since he sent the gift.
And, in 2017 Thomas Jr was charged for allegedly holding a gun to a woman's head during an argument.
The 55-year-old joining a set of famous faces in the reality TV house including Caitlyn Jenner and ex-political aide Omarosa.
Married at First Sight Star Jessika Powers and Kyle Sandilands' ex Imogen Anthony are also starring on the show.
Other housemates include Australian Survivor star Luke Toki and former football players Matt Cooper and Dayne Beams.
Bernard Curry, model Ellie Gonsalves, influencer Josh Carroll, and 2021 Big Brother Australia star Daniel Hayes are also among the contestants.
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Controversial commentator Katie Hopkins, 46, was deported ahead of the show after threatening to break quarantine rules.
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She is said to have posted a video online saying she would answer the door naked and maskless to people delivering meals — in breach of the rules in locked-down Sydney
Seven Network and Endemol Shine condemned her “reckless comments” and confirmed her axing.