The former reality TV personality and her NBA star boyfriend kept things steamy while they attended a rooftop bash to celebrate Jenner’s tequila brand, 818 Tequila on Wednesday, August 18.
According to a source who attended the party, the two lovebirds were “laughing, playing around with each other and kept making contact throughout the night, and never stayed far away from each other.”
“At the end of the night, they walked out together hand in hand with nothing but smiles,” the inside source told PEOPLE.
Jenner’s friends were also in attendance for the event, which took place at the Sunset Beach Hotel on Shelter Island in New York. Notable guests included Karlie Kloss, Derek Blasberg, Luka Sabbat, and Fai Khadra.
Booker also appeared “very close and friendly” with all of Jenner’s friends, the source added.
COVID-19 precautions were also put in place for the A-list event. All guests, regardless of vaccination status, were required to bring proof of negative PCR or rapid test results in order to attend.
The rooftop celebration with her squeeze came just after Jenner toured around the Hamptons to raise a toast to her award-winning tequila all day long.
During the trip, Jenner visited a handful of beach clubs and restuarants in Montauk, including The Beach Club at Gurney's, Sandbar, Bounce Beach and Ruschmeyers, where she promoted her brand by shaking up some signature 818 Tequila cocktails.
The supermodel, 25, and Booker, 24, just celebrated their one-year anniversary this summer after going public about their relationship on Valentine’s Day.
“It’s easy because they get along well and he also gets along great with her family,” an insider previously shared.
The Keeping Up With The Kardashians star recently took to social media to show pride for Booker, as she posted an Instagram story with a picture of her television to celebrate her man’s big Olympic win.
Jenner's story featured a snap of Booker on the basketball court walking next to one of his teammates draped in an American flag. She used the gold medal emoji as the caption for the pic.
“She is crazy about him. She has never looked happier. Her whole family loves Devin too,” a source told PEOPLE in June.
“Devin is such a cool guy. He is very low-key and doesn’t want to be a celebrity. He is very sweet to Kendall,” the source continued.
As OK! previously reported, Jenner once again supported Booker while the pair celebrated his Olympic win while on a romantic lake getaway.
Booker posted an Instagram shot featuring the model posing in a green bikini while sporting his gold medal.
He captioned the post, "Lake BOi."