Included in the photos were details of the birth, with a card revealing the baby was born at 5.25pm last Thursday in Adelaide and weighed 3460gm.
The Voice coach Guy and his fashion guru wife Jules couldn’t wait to share their delight at the announcement of a new family member
“I’m dying to see him,” Guy, 39, gushed.
Jules added: “The love is deep. My babies had a BABY. Love all 3 of you.”
Last week Chris, 32, revealed his excitement about the impending arrival of Jeremy’s baby during an interview with WHO.
“My younger brother is having a baby tomorrow,” Chris spilled last Wednesday.
“So Christmas this year is going to be an extra special one. I’ve got an eight-month old [daughter Ava] so it’s her first Christmas. And then yeah, Jeremy my younger brother will have a baby tomorrow. That will be the sixth grandchild for Mum and Dad.”
Jeremy, Chris and Guy also have an older brother called Ollie, 42, and all four siblings are well-known to be tight-knit.
When Chris competed on The Voice earlier this year – ultimately winning the show – his appearance caused brother Guy, who was a coach, to choke back tears with pride.
Meanwhile, speaking to Woman’s Day earlier this year, Chris gushed about the brothers’ parents Ivan and Nellie and how they chose to raise them.
"The families we have all built and cultivated is the thing they are most proud of," Chris said of his mum and dad.
"They are beyond words, and I couldn't have asked for a better upbringing. Us brothers are so close because they taught us to be [and] we ended up with great women in our lives because we had an example of what one looked like."