"Do I think they’re dating? Yes," Khloe told ET's Kevin Frazier, who was first on the set of Kocktails With Khloeon Thursday, where she opened up about the cute couple's relationship status.
"I don't know if they're like boyfriend-girlfriend," Khloe explained to ET. "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."
A source close to Kendall told ET that "there has been something going on with those two for a while" and it was the 20-year-old model "who made the first move," inviting the 21-year-old One Direction member on the trip.
Kendall, who showed off her figure in a string bikini, laid out on the deck of the yacht with a shirtless Harry, who rocked his signature man bun. The two were even caught in what looked like a steamy lip-lock aboard the ship.
At the People's Choice Awards on Wednesday, Ellen may have inadvertently confirmed the duo's couple status when she spoke with ET backstage after the show.
In gushing over Harry and Kendall, the talk show host insinuated that the two are romantically involved, saying, "They're very sweet. "I like both of them individually and I like them together as well."