Jason Oppenheim proved he's a very friendly with brother's ex-girlfriend Tina Louise as he walked in Bondi with her alongside his girlfriend Marie-Liu Nurk on Tuesday.

The Selling Sunset star, 45, who has spent Christmas in Sydney, was also joined by Tina's new partner Sei Moon with Jason joining them with a mystery woman.

Opting for head-to-toe designer gear, Jason shunned the recent Balenciaga scandal opting for $175 socks and $1450 sneakers from the Italian fashion house.

He added black shorts and a white Saint Laurent T-shirt, while protecting his head from the sun in a khaki bucket hat.

Meanwhile, Marie-Lou Nurk showed off her sensational figure in a white swimming costume with super low rise black joggers and Dior sneakers.

Representing her boyfriend's hometown, she shielded her eyes in a navy LA baseball cap and opted for a relaxed beachy look with minimal make-up.

The 25-year-old added gloss to her surgically enhanced lips while adding a lick of black mascara to her eyes.

Finishing off the look the star opted for multiple chains and rings. 

Meanwhile, Tina Louise showed off her blossoming baby bump in blue and white striped shorts and a khaki crop top. 

She added Birkenstocks and shades while her partner Sei Moon also appeared to go hippy with black shorts, thongs and a patterned open collar shirt.

Jason's brother Brett also joined the the group opting for green shorts and a black T-shirt.

Jason and Marie-Lou were first linked in July 2022 - six months after Jason split from his Selling Sunset co-star Chrishell Stause. 

The pair reportedly started dating after meeting on vacation in Greece.

The couple were spotted packing on the PDA during their trip abroad and later shared a photo posing together.

Shortly after, they made their red carpet debut and went Instagram official.

Although they have not been together for very long, the pair spoke with People in August about being on the same page for their future plans.

Marie-Lou resides in Paris where she works as a model and perhaps they will move there after filming the newest season of the real estate reality show.

Jason also previously spoke about not wanting children but is now considering the next step with his girlfriend.

'I'm more open to being a husband than I am a father right now,' he said. 

'I like the idea that there's no pressure, or a thought about having to have a child with Lou. So it just makes it easy for us.'

Marie-Lou related to the sentiment about not wanting children at the moment: 'I think for the next ten years, I'm good. And that's a long time, so I'm not even thinking about it yet.'

Tina and Brett called recently off their relationship in 2021 after dating for eight months and have remained committed to their friendship since.

Speaking shortly after the break-up,  Tina admitted she wanted to take her relationship with ex Brett Oppenheim to 'the next step,' but he wasn't quite ready yet.

The 40-year-old model noted that Chrishell Stause and Jason Oppenheim's ill-fated romance may have been the catalyst in their own relationship as it helped them discuss their own wants and needs.