Justin Bieber, Kourtney Kardashian rumored to be hooking up as pop star makes alleged dig at Scott Disick

Is Justin Bieber really hooking up with Kourtney Kardashian?

The Canadian pop star added fuel to the fire by posting a sexy Instagram snap that appeared to taunt Kardashian's ex Scott Disick — AKA The Lord.

“Lord knows…,” the 21-year-old captioned a photo of himself standing over an unidentified woman, who was reclining on a black Audi.

According to Us Weekly, the “Boyfriend” singer has been bragging to pals that he has been enjoying a fling with the 36-year-old mom-of-three.

The duo were spotted at Nice Guy nightclub in L.A. on Friday where sources told the magazine they appeared “flirty.” They also reported that the two “text each other all the time.”

Following their night out, the reality star went to the Beverly Hills hotel The Montage, where Bieber is a regular, and she didn't depart until 4 a.m., TMZ reported.

Back in October the pair met up at the same hot spot before enjoying Universal Studios' Halloween Horror Nights Attractions and Kardashian was also at Bieber's American Music Awards after-party on Nov. 22.

However, amid the Bieber rumors Kardashian has still been seen with Disick since his stint in rehab. They have been spotted furniture shopping with their son Mason and Disick spent Thanksgiving with the Kardashian clan.

Meanwhile Bieber's ex Selena Gomez is doing nothing to quell rumors of her own rumored romance with Niall Horan despite vehemently denying anything was going on between them in an interview with Entertainment Tonight.

 The 23-year-old former Disney star was spotted hanging out backstage at “The X Factor” finale in London while Horan's band One Direction performed. It was the band’s final performance before they take an extended break. Later the pair left the after-party at The Edition Hotel together.