Keira also sent her best wishes: "Omg... Congratulations you beautiful soul."
Fellow Bachelor in Paradise star, Sam Cochrane, also congratulated him, writing: "Congratulations my brother!! I'll crack a bottle when I see you next. So happy for you both."
Jared (also known as American Jared to Aussies) is arguably one of the most famous personalities in the American Bachelor universe.
The reality tv star appeared on The Bachelorette and two seasons of Bachelor In Paradise, in addition to an appearance on the Australian version of the spin-off.
During his time on Australia's Bachelor In Paradise, Jared romanced Megan Marx and Rachael Gouvignon, and flirted with Leah Costa.
However, true love shone through as he quit Bachelor in Paradise before the finale to reunite with his future wife, Ashley.
Jared opened up his decision in an episode of Ashley's show The Story Of Us.
"I remember I was on a date with a girl in Paradise … and I was just sitting there and thinking, ‘God, I wish Ashley were here,'" he said.
"I just wanna hang out with Ashley."
The couple announced their engagement in June 2018, and believe they are perfect for each other.
Ashley - who appeared on The Bachelor, Bachelor in Paradise and The Bachelor Winter Games - told People that they "freakishly agreed on everything" when it came to their nuptials.
"Growing up we had the exact same vision of our wedding, [doing] it as grandiose as it has become."