The surprise engagement comes after Jess recently opened up about their wedding plans - or lack of them!
Speaking on KIIS FM's Kyle and Jackie O show in August, the former Australian Idol star revealed that any thoughts of a wedding have never crossed her mind.
"Have you organised any weddings? This boyfriend has been hanging around for a long time now," shock jock Kyle Sandilands asked.
"I haven't had any time to pull that stuff together!" Jess coyly replied.
Saying what we were all thinking, Kyle shot back: "That's bull s**t, Jessica, I don't believe it!"