"I am very cautious of people whose actions don't match their words ... When it's all for show," Lauren shared on her Instagram stories.
She followed it up by reposting Jimmy's Instagram story of him taking care of the boys.
Lauren added the caption: "You're the most amazing dad, I admire you more and more each day for everything you do for these boys!"
Lauren's messages were posted as Nadia appeared on Studio 10 as well as mingled with pals in the Birdcage Marquee at Flemington.
Nadia has remained calm in public while navigating the split from her husband, despite the dramatic circumstances.
The 34-year-old fashion blogger recently revealed she has decided to keep Jimmy's last name and told The Sunday Telegraph that she won't revert back to her maiden name - Coppolino.
Although she says dealing with her marriage break down has been far from easy.
Ahead of her appearance on Channel Seven's The All New Monty: Ladies Night last month, the mum-of-two touched on the difficulties surrounding the break up.
"It's been a tough time personally for me recently, it's just so painful."
WATCH: Inside Nadia Bartel's lavish party for son's first birthday