The Biggest Loser host decided to embark on the social media trend, 'the 10 year challenge' and fans quickly noted how different she looked a decade ago.
'Wow you look like a totally different person!' wrote one follower.
Is it the same person? How come the pic on the right has big lips? commented another.
'Your lips have grown,' said another.
'Stop playing with your lips gorgeous x' advised one more.
Despite fans commenting that the celebrity may have altered her appearance, Fiona recently admitted she had found confidence in her looks.
“In the morning, I always look in the mirror and give myself a compliment,” Falkiner told news.com.au.
“The old me, years ago, would stand in front of the mirror and tear myself apart. I think a lot of women do that and it’s not worth it. There’s no point to it, it’s just ridiculous,” she said.