In a post shared to her page on the same day as she departed Sydney, Cass revealed she’s rather be staying in the city.
“Wish I could be in Martin Place right now with the women and men walking out to raise awareness of the gender pay gap in Australia,” Cass wrote.
“I’m with you in spirit.”
Her poignant post came as ex husband Karl and new love Jasmine prepared to tie the knot in Mexico.
Cass appeared serious as she waited in the airport lounge – talking on her mobile phone.
She was dressed casually for her departing flight in simple jeans and a white long-sleeved top.
And speaking at an event in Sydney on Tuesday, the journalist was candid about her approach to style.
She said she "couldn't relate" to women whose main priority is to appear stylish.
"[Life] is not a fashion show, it's not a competition...It is not a competition on going out and dressing up," the mother-of-three said, The Daily Telegraph reported.