Tyler sported a white T-shirt and cuffed jeans, while Gigi also looked comfortable and casual in a loose-fitted green T-shirt, ripped jeans, gold jewelry and a messy bun.
In addition, Tyler was seen leaving Gigi's Manhattan apartment early Monday evening, E! News reported.
Tyler reportedly left Gigi's Manhattan place around 6PM to meet up with his friend Matt James, according to an eyewitness. And roughly 45 minutes later, Gigi was seen leaving her building in an all-black outfit to meet some of her friends in the Soho neighborhood.
"Gigi looked good," the eyewitness told E! News of her Monday-night look. "She was casual and seemed very chill. It seems like they are definitely spending more time together and growing close."
Sources have claimed Tyler and Gigi's romance is just a fling, but they've certainly been spending a lot of time together recently.
"They are both gorgeous and single and they've had fun spending time together. He's living in the moment and not thinking too much past that," a source recently told E! News.
Tyler spent the night with Hannah Brown a couple of days after The Bachelorette's Season 15 finale aired on ABC on July 31, but another source told E! News the reconciliation "is not going to amount to much" and Tyler is just having fun right now and not taking anyone or anything too seriously.
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.