Kat Stickler Kisses Boyfriend Jason Tartick as She Pokes Fun at Trolls Who Say They Look Like Siblings

Jason Tartick just took his relationship with Kat Stickler to the next level.

On June 18, the influencer, 29, posted her first-ever TikTok video featuring Tartick, 35, as she joined in on a trend girlfriends have been doing to prank their boyfriends.

"Come here really quick," Stickler said as the video started, and Tartick walked right past her and up to the camera, examining it, before she placed him next to her.

"What are you doing?" he asked.

"If you wanna get to him," Stickler said, doing the beginning of the trend, before Tartick responded, "Oh, God."

"You’re gonna have to go through me," she continued, before getting onto her tippy toes to give Tartick a kiss.

"What is this?" he asked, before she delivered the trend's punchline: "Best brother ever."

The former Bachelorette star made a gagging sound in response, and tried to walk away as Stickler wrapped her arms around him. “What the f--- is wrong with you? Delete this,” he said while they both laughed.

“You guys have no idea how long I’ve been wanting to do this," Stickler wrote in the caption, likely referencing how long she's waited to post her boyfriend — who PEOPLE confirmed she was dating in April — on her TikTok, as well as to join in on the trend.

In the comments, fans pointed out the irony of Stickler and Tartick joining the trend, as people have previously said they look like they could be siblings. "HAHAHA okay golden bc everyone is saying yall look alike 😂👏🏻," one person wrote.

Stickler is Tartick's first relationship since the end of his engagement to Kaitlyn Bristowe last August. And while there had been speculation for weeks about him dating the influencer, he had stayed mum on the topic – for a reason.

"Due to such a public breakup, even when I think about the idea of talking openly about my dating life, I get like, 'Oh, that scares me,'" he told PEOPLE in March.

However, he described Stickler as "an amazing person, lovely, great mother [and a] hilarious content creator," adding, "I only have incredible things to say about her."

Last week, on June 12, the couple went Instagram official with their relationship as they shared a loved-up shot of themselves in a joint post.

"Heart is full 🫶🏻," they captioned the two photos, one of which saw Tartick plant a kiss on Stickler's cheek.

On Father's Day, they took things to yet another level as he shared on his Trading Secrets podcast that he'd introduced Stickler to his family.

“It's such an exciting time in my life, and I'm just beyond thankful for all the love and support,” he said on the June 17 episode. “Very, very sweet, very kind, received so many thoughtful messages, text messages, calls, and just I honestly have no other words than peace, happiness, and just grateful. Like, just very, very, very, very grateful.”

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Tartick said Stickler was "meeting everyone" as he was in Charlotte, North Carolina, with his parents, brother and brother-in-law, and she was along for the trip.

“So it's it's a really, really special time, and I'm just beyond, beyond grateful for everything. And so. thank you. I feel like I'm gonna get emotional, so I'm gonna stop. But thank you.”