Since giving birth to her fourth child three months ago, Cass has been open about her battle with her weight.
And after months of hard work, the 34-year-old former Seven Year Switch participant took to social media to show off her weight loss.
Cass posted two images of herself in her underwear side by side - one with from July (just a month after giving birth to baby Mena) and the other taken on the weekend.
'Absolutely blown away by the changes my body has gone through over the last few months,' she wrote.
'I made diet changes only two weeks ago and have only been training 3 days a week since 8 weeks postpartum so the differences in these pics are motivating the s*** out of me! .
'I'm sharing this so publicly as I want women everywhere to see a transparent post pregnancy transformation. There are so many super Mums in the media and on social media with freakish genes who 'bounce' back (and no doubt work bloody hard for it) from pregnancy like it was nothing, and I'm so envious of them however that's not me and let's be real it's probably not 90% of us. It takes me time and a lot of hard work these days to move this junk in my trunk!
'My best advice thus far is be consistent. If you loose your way today, then make sure you wake up tomorrow with your goals in sight and give it another bloody good go. I'm sooooo happy I started. My confidence and self respect is returning and everyone can see it.
Come on Mumma's if I can do it... then anyone can! Tag me in your transformations so I can follow your journey and motivate each other.'