Roxy Jacenko reached her goal weight of 51.9kg last month after shedding 15 kilograms.
And the PR Queen, 44, has now revealed exactly how she has managed to keep the weight off.
Roxy told Daily Mail Australia she maintains her slim physique by doing daily contrast therapy, which involves taking baths in warm and cold water from Monday to Friday.
This method is believed to help to improve blood circulation throughout your body.
She also does 40 minutes in an infra-red sauna each day before completing a 45-minute workout on the treadmill at speed 6 and rolling hills, all while doing low weight exercises.
Roxy also revealed she eats just one meal a day at dinner and it is focused on protein only.
Roxy Jacenko (pictured) has revealed the extreme habits she's adopted to maintain her 15kg weight loss. Pictured left is Roxy in 2022, and this week, right
'I don't do breakfast or lunch, instead I do dinner at 7pm each day which is focused on protein only and salad,' she explained.
'Last night I had grilled calamari, rocket pear and Parmesan salad. If I'm desperate for something sweet, I have dark chocolate covered sultanas.'
Roxy also has an AG1 supplement, which includes multiple vitamins, minerals, probiotics and plant compounds, every morning.
She said she only drinks alcohol on the weekend if she has an occasion and limits herself to two drinks.
Roxy also recently spoke about the terrifying moment she overdosed on Ozempic in an effort to lose weight.
She revealed she'd taken four times the recommended dosage before she suffered from severe vomiting and non-stop shaking.
'I put so much weight on. I would have to undo my jeans when I sat in the car so I got sucked in by it,' she explained on The Lazy CEO Podcast with Jane Lu.
'I bought it, I tried it. I took four times the amount in the first go.'
Roxy told Daily Mail Australia she maintains her slim physique by doing daily contrast therapy which involves taking baths in warm and cold water
Roxy continued by saying she's 'so sick of people' who deny using Ozempic, adding: 'I call a spade a spade on my platform and I don't care.'
She also previously said she thought she was going to 'die' after taking one milligram of the diabetic treatment, which was four times the amount prescribed to her by a doctor.
'I thought I was actually going to die. I have had cancer, radiation therapy, all of that. It doesn't even compare to how bad I felt when I took this drug,' she told The Saturday Telegraph.
'For the first 12 hours I was OK. I vomited four times that morning, once in a hire car, and I went to work.'
Roxy revealed she then suffered from severe vomiting and non-stop 'epilepsy type' shaking which landed her in a drug overdose clinic for three days.
'I called an ambulance. An ambulance was going to be an hour away but I thought I was going to die. I went to St Vincent's,' she said.
Roxy has since put out a warning to all who are tempted to use Hollywood's latest quick-fix weight loss drug.
Roxy also revealed she eats just one meal a day and has a AG1 supplement every morning
She said using the drug was 'pathetic' and 'silly', and called for celebrities to stop lying about not using it to shed kilos.
Ozempic has been a hot topic in Hollywood with stars either admitting to using the diabetes drug for weight loss or staunchly denying it.
Semaglutide is sold under the brand names Ozempic and Rybelsus as an antidiabetic medication used for the treatment of type 2 diabetes.
It is also sold under the brand name Wegovy as an anti-obesity medication for long-term weight management.
The drugs act like a hormone in the brain which causes people to feel less hungry and slow the clearing of food from the stomach, which spurs weight loss.
Ozempic and Wegovy have surged in popularity since becoming the first drugs proven to aid weight loss.