Jess's famous friends were quick to comment and congratulate the singer on her special news.
"Congratulations beauty xxx" said influencer, Elle Ferguson.
"About time ♥️♥️♥️" said celebrity hairdresser, Renya Xydis.
While Pip Edwards wrote: "❤️❤️❤️❤️"
Australian Idol winner Stan Walker said: "Love u fallas ❤️✊🏾"
"Congratulations beautiful woman ❤️" said model Megan Gale.
Ash London couldn't contain her excitement: "YES GIRL YES GIRL YES!!!!!"
Jess's Instagram post comes just one day after the star jetted into Sydney airport with her fiance, where she confirmed her engagement to waiting reporters.
"It’s very exciting," Jessica said of her big news.
"It was a big surprise; it was pretty crazy."
Asked if she thought the big question might be coming, the singer said she thought it might happen in the future, but not so soon.
"I didn’t expect it at all, that’s for sure," she said. "In the future, but not so soon."
And the shock timing of her engagement means she hasn't made any plans for the big day yet, as she admitted she hadn't thought about the ceremony at all.
"I haven’t, not quite yet," she told reporters.
"It’s definitely not something I’m thinking about at the moment."