Rocket, five, and Racer, four, struck a pose in superhero costumes for the photo captioned 'Lockdown 2.0'.
Lara, 34, and Sam, 44, who relocated to Sydney from the US in January, are currently among millions of Sydney residents enduring a gruelling Covid lockdown.
The couple also share baby Racer, who they welcomed in June 2020.
However it wasn't until April this year that the Aussie couple revealed the tot's name, which kept in theme with his older brothers' 'R' names.
Lara first revealed she was pregnant with her third child back in November 2019.
"Yes I'm pregnant! I'm having a boy, early next year. It's my third boy and we're all very excited and very happy," she told Vogue Australia at the time.
"I'm having a boy, early next year. It's my third boy, and we're all very happy. I think any addition brings joy and happiness to the family, but more so when you can share it with the other boys. It's such a boys' club in my house!"
Lara, who is the founder of beauty brand The Base and also holds ambassador roles with luxury brands including Tiffany & Co and Louis Vuitton, said her main focus in life is being a mother.
"My husband is amazing. He's a fantastic father, fantastic husband and we're a really good team," she previously gushed.
"We've grown together and grown as a family and I think that's the most important thing. He's just so good with the kids, he does the night feeds and everything – he is seriously superhuman!"
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