Alison Hammond is mostly known for her role as a presenter on ITV's This Morning, after having first rose to fame appearing on Big Brother in 2002.
The 46-year-old has lost a lot of weight by making changes to her diet and starting a fitness routine.
At her heaviest, the presenter revealed she weighed 20 stone and decided to make a change.
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She signed up for WW and is now an ambassador for the group, the Daily Express reports.
Alison has shared a series of snaps with her Instagram followers, showing different looks from the past twelve months.
The "reel" begins with Alison dressed in black sequins, with her hair in a sleek high ponytail.
The " This Morning " logo can be seen in the background.
It's a new look for the TV star, who usually has her hair down, with curls framing her face - and her clothes usually have at least a splash of colour.
Other photos in the post include a number of selfies, as well as shots of Alison looking extremely glamorous at various events.
Captioning the post, she said: "12 Months ! Thought it was cute might delete later. Happy Boxing Day !!"
Model and fellow This Morning presenter Lisa Snowdon simply posted five heart emojis.
A number of Alison's fans have also left messages.
fatgirlonamish said: "You're beautiful"
lady_lu_oxo said: "Don't delete, it's a great reel, lots of lovely memories and you look divine x"
ballantynesian said "You can see your weight loss Alison - keep as a positive motivator - amazing well done you …. And by the way your ruddy skin is AMAZING"
zuzanakarasekov said: "You're a goddess, love you loads"
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