Kendall Jenner and Jordan Clarkson ‘Definitely Had a Flirty Vibe Going On’ at AMAs Afterparty, Says Source

Kendall Jenner enjoyed a night out on the town Sunday night — and spent some time with one special guy.

A source tells PEOPLE Jenner, 21, “definitely had a flirty vibe going on” with Los Angeles Lakers player Jordan Clarkson, 24, at Drake‘s 2016 American Music Awards afterparty at L.A. hotspot Delilah.

The insider says Jenner arrived just before midnight, wearing black pants and a white cropped shirt that was tied up around her waist. The Keeping Up with the Kardashians star was with her sister Kylie Jenner‘s best friend Jordyn Woods, and also spent time at her table with fellow models Karlie Kloss and Joan Smalls.

Clarkson, whom Jenner has been linked to this past year, joined her shortly afterwards. According to the source, once the basketball player arrived he and Jenner spent the rest of the evening together.

“They definitely had a flirty vibe going on and were very intimate,” says the source, who says Jenner — who recently celebrated her 21st birthday in style — sipped on a cocktail at the beginning of the evening before switching to water.

Several other stars stopped by to chat with the duo, including rapper G-Eazy, Nina Dobrev and Heidi Klum, but the source says Jenner and Clarkson seemed mostly interested in each other.

“Jordan was extremely attentive towards her and treated her like his girlfriend,” says the source, noting that the two spent much of the night at their table, cuddling on top of the banquette with their arms hooked together.

Jenner’s sister Kourtney Kardashian soon joined the duo at the table, and the source says Kardashian, 37, and Clarkson were “definitely bonding.”

“Kourtney was in good spirits and seemed excited to be out on the town,” says the source. “She was constantly laughing.”

According to the source, Jenner, Clarkson, Kardashian and the rest of their crew made their exit shortly afterwards.

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Jenner and Clarkson were first linked in March when a source told PEOPLE the two had been “secretly dating” and were “super into each other.” In July, sources confirmed to PEOPLE that the low-key romance was still going strong, but by August, a PEOPLE source said Jenner is “just having fun and not taking anything too seriously with anybody right now.”

“ like each other, but it’s not a deep relationship at the moment,” said the source. “They’re on the same page.”

Most recently, Clarkson attended Jenner’s star-studded birthday bash at Los Angeles hot spot Delilah. While Jenner’s other rumored love interests — Harry Styles and Travis Scott — were also at the party, a source told PEOPLE the star was “super excited” to see Clarkson.

“Jordan showed up late in the evening,” said the source. “She ran over to greet him and kept looking for him.”