Tyler, 26, and Gigi, 24, enjoyed a date at Dumbo House, a members-only club in Brooklyn on August 4 and then Tyler went back to Gigi's Manhattan apartment after their night out together, Us Weeklyreported.
Tyler and Gigi reportedly left the club separately around 10PM, with Gigi leaving through the front entrance near a bakery and Tyler sneaking out a back door and through an alley.
The pair, however, got into the same SUV after their evening together, and a chauffeur drove them to Gigi's home in the NoHo neighborhood of New York City, according to Us.
An eyewitness told the magazine Gigi "looked very happy" when she exited the club, while Tyler was also "smiling as he entered the car." But it remains unclear how long Tyler stayed at Gigi's place and when he left.
The date seemed to be a success either way, however, because the eyewitness reportedly said the couple "were laughing and having a great time with each other" eating and drinking on their date inside Dumbo House.
Tyler wore a casual, striped T-shirt and jeans on his date, and Gigi sported an oversize green top, jeans and black boots.
Tyler's outing with Gigi came three days after Tyler visited Hannah at her Los Angeles lodgings and apparently slept over.
TMZ took photos of Tyler leaving Hannah's place the next morning, and he appeared to be wearing casual workout clothes while Hannah wore a plain white T-shirt and comfortable black shorts.
Hannah had asked Tyler out on a date during the live portion of The Bachelorette's fifteenth season finale on Tuesday, July 30, after America discovered she had dumped her season's winner, Jed Wyatt.
Tyler publicly accepted Hannah's invitation to "hang out" and "have a drink," but he told People it would not be healthy to jump back into a relationship with her after a whirlwind couple of months and his heartbreak.
While some social-media users may not think it's a big deal to follow someone on Instagram, Gigi has nearly 50 million followers -- but she chooses to only follow about 1,000 people.
Instagram has also sparked many relationships, including Bachelor Nation's Wells Adams and actress Sarah Hyland, who began their romance by flirting on Twitter in 2016 and are now engaged.
Singer and former The X Factor judge Demi Lovato has also been flirting with Mike Johnson from Hannah's The Bachelorette season on Twitter, and he hasn't been shy in multiple press interviews about the fact he might be interested.
Before setting eyes on Tyler, Gigi reportedly had an on-again, off-again relationship with Zayn Malik from late 2015 through January 2019.
Not only has Gigi modeled in high-profile campaigns and runway shows, such as the Victoria's Secret Fashion Show, but she has also graced the covers of magazines including Vogue.
Gigi has also previous ties to the reality TV world.
In addition to being the daughter of former The Real Housewives of Beverly Hills star Yolanda Hadid and having made appearances on then Bravo reality series while her mom was a cast member, Gigi is also the best friend of Keeping Up with the Kardashians star Kendall Jenner.