Kendall Jenner has been spending tons of quality time recently with One Direction's Harry Styles, the two having been spotted out plenty of times together over the past few weeks, getting dinner, hanging out at clubs and even leaving a NYC Hotel together. But big sister Kim Kardashian and her fiancé Kanye West are allegedly warning the teen to stay away from him, Now magazine reports.

"Harry and Kendall have been circling each other since being introduced a few months ago and are finally taking that next step," said an insider. "But Kim knows all about being played and fears Kendall will get hurt by the king of heartbreakers."

Nineteen-year-old Styles has been linked to a number of Hollywood beauties, from Cara Delevingne to Taylor Swift and even 34-year-old "X-Factor" host Caroline Flack, and as he one of the world's biggest heatthrobs, it's likely Kardashian is concerned that he'll play her little sister, who only recently turned 18.

"Apparently Kanye's been telling Kendall that rock stars can be dogs," the source added. However, Kardashian's reps denied that the 33-year-old reality star has been meddling in Jenner's love life, and an Us Weekly source recently reported that Styles and Jenner plan to "hang out more" in the future.

Taylor Swift has reportedly been "really hurt" by the latest developments in Style's love life, as she had been expecting her ex-boyfriend to spend the holidays with her.

"Taylor still has feelings for Harry and he's been totally leading her on," a HollywoodLife source claims. "She expected him to be chasing her down when he came to LA a few weeks ago and instead he went after Kendall Jenner, it was a huge blow for Taylor.