In the emotional post, the singer confessed: "When Motivation lacks, I look at how far I’ve come and I don’t ever want to go back to that girl in the white singlet!"
"@wlcw.aust has changed my life, not only in shape and size but my mindset." she continued.
The 29-year-old went on to honestly admit: "It’s not an easy road, (I’m not going to lie) but the payoff is so rewarding! Just to feel better in health and be able to run a little longer each week makes me feel so much stronger in the person I am, and how proud I am of myself for coming this far! It’s a long road and I am going to give it all I got!!"
Fans were quick to Congratulate the star for her amazing efforts.
"Well done Casey! Keep going, you are an inspiration!" one wrote.
Another commented: "Beautiful inside and out. Well done chicky keep up the great work 👏👏👏".
Congratulations to the star!