The news of Cass' TV gig comes after New Idea exclusively revealed the author let rip in an extraordinary outburst after Karl's wedding to Jasmine Yarbrough.
As Cass arrived in Sydney after a weekend in Melbourne, she didn’t hold back.
“He’s thrown three weddings for goodness sake. Who needs three weddings in a year, give us a break,” Cass told a reporter at Sydney's airport.
“Three weddings and a funeral. We had a funeral and it was my dad’s.”
Cass went on to claim her ex had “a lot to hide”.
“I’ve done a lot of reading about narcissism,” she added.
“Everything he says is about this fake person who lives in this fake castle, it’s not real,” Cass continued.
Karl is yet to comment on his ex-wife's blistering attack.