While neither of them actually won the series, with Peter Corbett ultimately pocketing the $250,000 cash prize, the pair won the hearts of the nation and quickly became Australia's ultimate reality TV couple.
In 2004, the couple were married in their own spin-off reality TV show named Marty & Jess: An Outback Wedding.
But 15 months later the pair divorced, with Jess going on to focus on her career studying law and becoming a radio host.
Marty meanwhile went on to remarry, and now has three children with his second wife Lexi.
As the refreshed and rebooted new season of Big Brother returns to our airwaves this week, Jess is telling all on her infamous reality romance, including that very intimate moment.
"I'm not an exhibitionist, but you do kind of forget and you like the intimacy, you feel like you've got an ally, you get a little cosy and before too long it's the dancing doona all over again," Jess explained during an interview on Triple M's Moonman In The Morning this week.
"It feels like it's the right thing at the time, you don't remember the cameras are there."
As for why the seemingly loved-up poster couple split soon after tying the knot, the blonde beauty admitted the chemistry quickly fizzled out.
"He's got a happy ending with another lovely lady, they've got a family and he's all loved up. He's back on the farm," Jess, who describes herself as "embarrassingly single", mused of her ex.
This story originally appeared on our sister site, Now To Love.