EXCLUSIVE: Kendall Jenner Made the First Move on Harry Styles

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Kendall Jenner seems to have had her eye on Harry Styles.

A source close to the 20-year-old model tells ET that she was the one to make the first move and invite the One Direction heartthrob to hang out over New Year's Eve.

WATCH: Kendall Jenner Says Kylie and Tyga's PDA Is 'Annoying' During Family Vacation in St. Barts

But Kendall and Harry's rendezvous in St. Barts might just be the beginning of a casual fling. ET's source says that Kendall is "just having fun right now" with the 21-year-old musician.

"It can't go anywhere serious. Kendall lives in Los Angeles and New York City, working constantly around the world, and Harry lives in London and tours around the world," the source explains.

WATCH: Kendall Jenner and Harry Styles Get Cozy in St. Barts -- See the Pics!

As of now, Kendall is "proceeding with caution" and "seeing where it goes."

"Kendall doesn't want to get hurt," the source says. "She knows what the deal is."

WATCH: Kendall and Kylie Jenner Have a Secret Handshake and It Involves Boob Slapping

However, Kendall's older sister, Khloe Kardashian, isn't afraid to define their relationship. "Do I think they're dating? Yes," she exclusively told ET's Kevin Frazier while on the set of Kocktails With Khloe. "I don't know if they're like boyfriend-girlfriend. Nowadays, I don't know. People are weird with stuff. So, I don't know their title. But I mean, they were in St. Barts together hanging out. So, to me, that's dating."

Check out more of ET's candid interview with Khloe: