In the picture, the model was smiling big as Erich wrapped his arms around her waist and held her close. He was also smiling for the intimate moment.
Elizabeth tagged the Season 19 The Bachelorette winner in the post and added a "smiling face with hearts" emoji, and Erich then also re-posted Elizabeth's posting on his own Instagram Stories.
Erich announced he's dating Elizabeth last week when he reposted a black-and-white Polaroid Elizabeth had uploaded first via Instagram Stories.
Elizabeth was kissing Erich on the cheek in the photo and captioned the image "Valentine," along with a red heart.
Elizabeth is a social media influencer who boasts nearly one million followers on Instagram. She is signed with ONE Management in New York City and is passionate about vegan food and animal rights.
She is also a clinical psychology grad student, according to her Instagram bio.
Earlier this month, Erich told OK! Weekly how he's taking things "verrrrrry slowly" when it comes to dating, although he didn't reveal he was in a relationship at the time.
Erich also said he wanted a partner who can "match my energy."
"I want to find my best friend, someone that I can vibe with every day. I want a partnership where we can lean on and support each other through the highs and lows," Erich explained.
"Someone open to adventure, but also down for the occasional White Lotus binge-watch in one sitting. And, fiery romance. Because at the end of the day, I'm a hopeful romantic. That's not too much to ask for right??"
Gabby confirmed her split from Erich while she was competing on Dancing with the Stars' 31st season. During the November 14 semifinals episode, Gabby explained how she and Erich "weren't each other's best match," nor were they "in step" or "in sync" in terms of their goals and approaches to life.
But the aspiring model, who worked as a real estate in New Jersey prior to joining The Bachelorette cast, said being on the show "pulled me out of my shell."
During the December 15 episode of the "Click Bait with Bachelor Nation" podcast, Gabby revealed that she and Erich had ended their engagement "pretty amicably."
"There's always time when you don't speak to your ex after [a breakup], but I don't wish him ill will at all. I genuinely think it unfortunately just wasn't the right time for us," Gabby told the podcast's co-hosts Joe Amabile and Natasha Parker.
Gabby shared how she and the New Jersey native were in "two different places" of their lives, which was "hard" for them to figure out while dating on The Bachelorette's nineteenth season given the process is so rushed.
"I think you don't realize the bubble you're in until you try to make the relationship work outside of the show... There's so much more learning after you leave the bubble, and I think we are just in two very different places in our life," Gabby explained.
Erich previously shared on Instagram Stories how he and Gabby simply aren't each other's person and he couldn't put his finger on one thing in particular that went wrong with their relationship.
Around that same time, Gabby opened up to Us about how her split from Erich "was hard."
"Ultimately, I'm just grateful that I was able to do it on my own terms and when I was ready. It was just a new experience overall -- being so public and being thrown into this. I think now it's just kind of trying to move forward," Gabby said.
Towards the end of Dancing with the Stars' 31st season -- which concluded with Gabby and her pro partner Val Chmerkovskiy finishing in second place -- Gabby started flirting with former Jersey Shore star Vinny Guadagnino on social media.
Beginning with a comment from Vinny on November 15 in which he called Gabby his "Baby Mamma," the pair sparked rumors they're romantically interested in each other, and fans have been shipping them as a potential reality TV couple ever since.
Gabby and Vinny reunited on the Dancing with the Stars tour earlier this year, after she mentioned in the media how she'd "of course" go on a date with Vinny if he asked her out.
Gabby even dubbed Vinny her "celebrity crush," and the tour is still going.