The couple often share sweet snaps of the five-month-old to their combined 940,000 Instagram followers, but until now have made a concerted to hide his face.
On Wednesday, to mark six months since Sonny was born, Elyse uploaded two black and white photos of her son smiling while being lifted into the air by Josh.
"The best six months of our lives. Sunny brightening up every single day like we couldn’t ever have imagined," the 28-year-old captioned the sweet tribute.
"We wanted to keep him to ourselves for a while but it feels right to share him now.
"This is why we are here @joshy.barker to bring up this little man safe happy and healthy. We love you buddy. Love mum and dad xxx."
Dozens of the couple's celebrity friends gushed over the adorable photos.
"He is soo soo cute !! Lil man," Nadia Bartel wrote, while fellow WAG Bec Judd called Sunny a "cutie pie".
"Oh my gosh he is heaven!!!," Fiona Falkiner wrote.
Earlier this month, Elyse exclusively opened up to WHO about the biggest challenges of motherhood, having more kids, and what it's like to raise a baby in Byron Bay.
"Sunny is growing into such a little dude now. He's so alert and fun, he's loving, full of smiles and he is so cuddly. I could smooch him all day long.
Elyse praised Josh as a "natural, hands-on" father to Sunny, and says the mutual adoration between the father and son is "beautiful" to watch.
"Josh works full time so when he comes home in the afternoon, he takes the reins," she said.
"Whether it's cuddles, a bath or a feed, Josh will take care of all that while I make dinner or take a shower."
The couple, who made the move from Melbourne to Byron Bay in 2019 to escape the hustle and bustle of city life, say the coastal tourist town is the perfect place to raise a child.
"You can create a warm and loving home wherever you are. Personally for Josh and I, we are big outdoors people. We value getting outside as often as we can, going on weekend adventures to beaches and or bushlands," she said.
To make the most of special family time, Elyse and Josh dedicate every Sunday to spending time with Sunny.
"We try not to make plans and instead just spend the whole day together. There is nothing more precious," Elyse said.
The Myer ambassador says five-month-old Sunny's routine is finally starting to form.
"He's just started to explore solids, so we can now feed him mashed up veggies for dinner at night," she explained.
"Filling his belly full of nutrients & goodness is helping to encourage longer, deeper sleeps. Thank the Lordy & hail to the veggies!"
And it's looking like more kids are on the cards for Elyse and Josh.
"We would love a big family," she said.
While Elyse has worked as a model for years, fronting campaigns for brands including Seafolly and later signing on as Myer ambassador in 2018, she became a household name following her successful stint on The Block in 2017 alongside Josh.