Justin Bieber and Kourtney Kardashian have reportedly rekindled their romance.

Following what appeared to be a months-long fling at the end of last year, Bieber was linked to Hailey Baldwin, but now, after weeks of not being seen with Baldwin, reports claim it is the Keeping Up With The Kardashians star who once again has the 21-year-old's attention—but only after he learned to keep their alleged relationship on the down low.

“Justin’s learned to keep his mouth shut, because Kourtney made it clear she needs this to be discreet for the sake of her kids as well as the complicated situation that’s going on with Scott [Disick],” an insider revealed to Radar Online on Thursday.

Bieber and Kardashian have been seen together every couple of weeks in Los Angeles for the past several months, and at the end of last year, Kardashian was caught sneaking out of Bieber's hotel suite at 4 a.m.

Although the report claims Bieber and Kardashian's relationship is back on, whether it be emotional or strictly physical, the reality star has continued to remain in contact with her sometimes-troubled ex-boyfriend, Scott Disick.

“That suits Biebs just fine,” insisted the insider. “He says Kourtney’s the best lover he’s ever had and he can’t stay away from her. He loves having an older, experienced lover and they have a great friendship connection, too, so it works for both of them.”

While the pair has remained silent about their relationship in recent weeks, Kardashian stepped out in a shirt which included the word "Cougar," seemingly confirming she was dating the younger man.

Tags: kourtney kardashian