Jared popped the question to Ashley, whom he met on Season 2 of Bachelor in Paradise in 2015, on the beach in Mexico on Sunday while filming an appearance on the summer spinoff's upcoming fifth season.
Shortly after news of the engagement broke, Jared posted a silly close-up photo of his fiancee's face and captioned it, "She's Ashley I in this picture. But to me she's the future Ashley H."
Jared, 29, is therefore suggesting Ashley will take his last name despite her being called "Ashley I" during all four of her appearances on The Bachelor franchise.
Ashley found love at first sight with Jared on Bachelor in Paradise 2, but Jared slowly developed feelings for her over time while keeping her in the friend-zone.
Due to their confusing relationship -- which included arguments over dating other people -- fans were shocked when Ashley and Jared confirmed in May they had been romantically involved since March.
"Love works in mysterious ways," Jared captioned a photo from the proposal on Instagram.
Ashley found fame when she competed on Season 19 of The Bachelor starring Chris Soules, while Jared joined Bachelor Nation when he fought to win Kaitlyn Bristowe's heart on The Bachelorette's eleventh season.