Cass's experience as a newly-divorced single mum has also brought a "new perspective" to the morning TV show, Sarah explained.
Adding how "funny" she thinks the mum of three is, and how she's a great fit for the show.
"She just seems happy, and that's what you want for everyone involved in that situation, right?" Sarah concluded.
Karl, 44, and Cass, who share children Jackson, River and Ava, split up in 2016.
Not long after the couple separated, Karl began dating, Jasmine Yarbrough, 35. And the couple were married in a star-studded Mexican ceremony in December 2018.
Cass is yet to make public any new relationships, although the Dancing with the Stars contestant became very close with Samuel Johnson on the show — with rumours of a romance between the pair.
“Samuel and I get along so well," Cass said at the time.
“We’ve gotten close and we ‘get’ each other. We clicked instantly.”