Were you to bump into Ayda off-duty tomorrow, she would almost certainly not be dressed in anything glittery or glamorous.
Given his self-confessed history of addiction, the occasional bout of nudity is small potatoes.
At a party in London last year Ayda spoke openly to friends about the inherent difficulty of being married to such a big star.
Today, he is worth somewhere in the region of £120 million, and the couple live a commensurate lifestyle, with sprawling mansions in LA and London's exclusive Holland Park. While acknowledging people are likely to think he is 'off his head', Robbie is unapologetic about his beliefs, and rarely misses an opportunity to espouse them. This is another reason he is so fond of her: like so many Los Angelenos, she is unshockable.
In the physical realm, Robbie has often said that he considers himself to be a nudist and will 'end up being one of those dads who embarrasses' his children.
And perhaps it is because of incidents such as these that Robbie and Ayda find themselves facing this lawsuit.
At the heart of the issue is Robbie's immense yet surprisingly fragile ego, coupled with his wife's determination to keep him on the straight and narrow.
So when Robbie celebrated his 41st birthday earlier this year by stripping off and posting the resulting photograph on Twitter — with a rude joke about the likelihood of his manhood 'breaking the internet' — Ayda simply roared with laughter.
After all, one glance at her modelling portfolio shows that the 35-year-old mother-of-two is not lacking in body confidence herself.
He started early, by posting on the internet a number of revealing and somewhat excruciating clips of Ayda giving birth to their son, Charlton, last year.
So one piece of footage shows her gyrating in front of her husband, swinging the cord from her pain-killing TENS machine like a feather boa while she throws out cheeky asides to the person in charge of the camera.
Yet taken out of context, the sexual references could be construed as something entirely different.