Reality TV star Khloe Kardashian says she's pretty sure her sister Kendall Jenner is dating singer Harry Styles.

"Do I think they're dating? Yes," Khloe told etonline.com on the set of "Kocktails With Khloe" where she opened up about the couple's relationship status.

However, she didn't comment whether the duo are "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," she added.

Rumours that Kendall and Styles were romantically linked began to swirl over the holidays when they were spotted getting cozy on a yacht while vacationing together in St. Barts on New Year's eve.