Justin Bieber and Kendall Jenner have allegedly started a "friends with benefits" relationship that the press thinks is becoming harder to hide.

According to HollywoodLife.com, the pair have gotten to the point where they flirt "hardcore" with one another whenever they are in each other's company.

"When Kendall and Justin are together, they flirt so hardcore," a source alleged. "They love telling people they're just friends, but they're playing with everyone -- there is more to it. They've hooked up in the past and there's still something there. They just like to keep it totally secret, but a lot of people know there is something there. They aren't fooling everyone."

The 21-year-old Bieber recently ended his relationship with Hailey Baldwin, leading to speculation by some that his dalliances with Jenner could have led to their split. Bieber's reported wandering eye doesn't seem to be a major concern for the 19-year-old Jenner.

"Kendall doesn't care who else Justin hooks up with and the same goes for him," the source added. "It's completely open and there's no jealousy. They've been friends for so long, so it's not a lie when they say they're good friends -- it's just more than that too."

Bieber has also long had an on-again, off-again relationship with "Come Get It," singer Selena Gomez, but the two publicly split late last year. Since then, Gomez has rumored to be dating DJ Zedd.

Bieber recently professed his love for Gomez and vowed to change his controversial ways for the chance to win her back. Over the last several months, Bieber has had at least two run-ins with police, including pleading to guilty to careless driving charges in Miami in August of 2014.