Last year, Hollywood cosmetic surgeon Dr Randal Haworth claimed that Michelle could be an "enthusiastic user" of both "fillers and Botox", Daily Mail Australia reports, and her flawlessly smooth skin is certainly something to behold.
Dr Haworth speculated the Aussie fitness star has plumped her lips and filled her under-eye area with Juvéderm.
"A tell-tale sign that filler was used to treat under-eye hollows is bulging below her lower eyes next to the nose. I can see Michelle has those when she is smiling in recent photographs," the surgeon told Daily Mail.
Daily Mail also noted the celeb weight loss expert's eyebrows "barely moved an inch" as she spoke to her 285,000 Instagram followers from the Victoria airport.
On the subject of Botox, Michelle has said: ‘I am a fan of anything that makes a person feel good about themselves and more confident’.
Michelle is mum to three-year-old son Axel, who she welcomed in December 2015 with former partner and The Biggest Loser co-star Steve 'Commando' Willis.
In the wake of their split, Michelle signed on as a contestant for the revamped Network Ten reality TV show Dancing With the Stars which aired earlier this year.