Now a size 16, the model is at her happiest and most confident.
Taking to Instagram on Tuesday, the 31-year-old posted a photo of herself lying in the sun topless as she tried to soak up the vitamin D before returning to a chilly London where she now resides.
Scroll down for video That's one way to avoid tan lines! Fiona first graced our screens as a contestant on The Biggest Loser, going from a size 20 down to a size 12 after losing 30 kilograms and coming in fourth place.
I've never been shy about sharing my love for big women, and I happen to think that Fiona is not only a knockout, she's also got a pretty impressive pair of tits too! If you are a representative of the photographer, provide signed documentation in your query that you are acting on that individual's legal copyright holder status.
But this one stood out a little more.
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If you're not up on all things down under, allow me to introduce you to full figured beauty Fiona Falkiner.
Clearly loving being away from the London cold, she posted another selfie in which she is seen enjoying an ice cream and seemingly wearing a strapless piece of swimwear, simply captioning the shot: 'Summer.