"Never been more shocked or sure in my life. I love you so much Tay, my FIANCE!!!" Tia, 30, captioned a selfie with Taylor as well as a brief video of his marriage proposal onstage from this past weekend.
In the video, it was hard to hear how Taylor popped the question considering the crowd was cheering and screaming, but once Tia realized what was about to happen, she shouted, "Are you kidding me?!"
Taylor proceeded to get down on one knee and ask, "Will you marry me?"
The product engineer and Tia then hugged and kissed, and "Bachelor Live On Stage" host Becca Kufrin joked, "No date card for you, Tia, you got the damn ring," according to Us Weekly.
Becca later flashed Tia's engagement ring on her Instagram Story and wrote, "My babes are getting married."
Tia gushed of Taylor last month on social media, "This guy truly doesn't get enough credit for putting up with my sh-t."
The physiotherapist continued alongside a selfie of the couple, "He came into my life during the most difficult season I've ever faced and hasn't wavered. I've tried to push him away more times than I can count, but he's stuck through it all."
"Maybe once we're on the other side of it, I'll write a book to explain, but for now here's some genuine soft smiles. ILY Tay," she concluded.
"Not gonna lie -- it's been nice keeping this to myself, but it's about time y'all know too," Tia captioned a sweet video of the couple at the time.
The video showed Tia and Taylor attending a wedding together, and they clearly have a playful dynamic given they had recorded footage of underwear poses, doggy snuggles and cooking together.
While Tia, originally from Arkansas, didn't specify how long she had been dating the California native at the time, Taylor confirmed the pair -- who currently live in Nashville -- were definitely in love.
Taylor captioned a slideshow of photos with Tia at the time and wrote, "It's hard to put into words how you truly feel about someone you love."
"I guess I'll keep it as simple as I've never felt more alive than when I'm with you," he continued. "With that being said I still had to make fun of you, hope everyone enjoys the last two slides."
Taylor included two funny videos of Tia asking "Why?" in her southern accent and smiling in a hoodie sweatshirt.
Tia originally competed for Arie Luyendyk Jr.'s heart on The Bachelor's 22nd season and made it to hometown dates before he sent her packing.
She also appeared on Bachelor in Paradise twice, with her latest stint having taken place in Summer 2021.
Tia seemed most interested in Blake, but he didn't put enough effort into their relationship, according to the bachelorette.
Tia revealed on Bachelor in Paradise that she has a history of dating men "who don't care" enough to woo her, and she's a person who believes in the notion that actions speak louder than words.
When Bachelor in Paradise was still airing, Tia shared on Instagram Stories, "I saw Thomas go by with a tray of chicken nuggets for Becca and a bunch of pics of their dogs just to be cute and sweet for her."
"And this dude," Tia continued of Blake, "says, 'You know I'm not gonna set up anything for you right? You should know how I feel about you. All that stuff other guys do is fake for TV.'"
Tia posted three embarrassed emojis after making her claim and added, "And I lost my mind."
Tia pointed out, "This ain't my first rodeo. It ain't that hard. Gimme nuggets & fries."