Former Australian Idol winner Casey Donovan has spoken about her incredible transformation that has everyone talking.

The popular singer and winner of I'm A Celebrity... Get Me Out Of Here! has so far lost an amazing 36 kilograms, and has told Woman's Day exactly how she did it.

Casey in 2014

The 29-year-old star has spoken how her stint in the South African jungle for I'm A Celebrity... Get Me Out Of Here! last year was the beginning of her journey to lose weight.

After eventually winning the series, and being crowned the 'Queen of the Jungle', Casey had already lost 19 kilograms.

And she continued to lose the wight when she returned home to Australia and joined Weight Loss Coaching Works.

Casey has now lost five dress sizes and revealed her number one tip is that 'working out doesn't have to be hard'.

Did that just happen? Merry Christmas Tree Everyone!!! What a magical night singing @carolsbycandlelight_aus Thank You so much for such an amazing night! And to each and everyone for all of your beautiful kind words! I love what I do!! Although, sometimes it completely takes my breath away, it’s in that moment you give me the clarity and faith I need to keep on going!! Thank You! Have a safe and happy new year! Here’s to a day shared with family and friends and the ones who are dear to us!! A big thank you to @channel9 for an Amazing night, my manager Renee and all of those behind and in front of the screen that made the night so special!!! Dress: @jadoreevening Jewellery: @colettebycolettehayman Heater and exit sign: #sidneymyermusicbowl #carols #jadore #merrychristmas #music #live #melbourne #classy #friends #haveyourselfamerrylittlechristmas #thankyou

A post shared by Casey Donovan (@caseydonovan88) on Dec 24, 2017 at 7:03am PST

The star says she starts each day with a walk and aims to do 15,000 steps daily.

Good on you Casey, great to see your hard work is paying off!