• Justin Bieber posted a cryptic pic on Instagram on Dec. 14, Monday.

Justin Bieber posted a cryptic pic on Instagram on Dec. 14, Monday. (Photo : Instagram)

Sparking fans' curiosity about his dating life, Justin Bieber allegedly spent the Tuesday night at The Nice Guy nightclub with onetime rumored girlfriend Kendall Jenner, amidst the reports that he is secretly seeing her half-sister Kourtney Kardashian.

The 20-year-old Victoria's Secret model reportedly partied with the Canadian sensation on Dec. 15, Tuesday, at the same hotspot where the 21-year-old singer reportedly hooked up with Kardashian on Dec. 11, Friday.

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Jenner and Bieber arrived separately at the Los Angeles club, soon after the latter's performance at "The Voice" finale. The two departed the club separately apparently in order to avoid to be clicked together by the curious paparazzi, TMZ reported.

While the red hood-clad "Baby" hit maker flashed a smile for the cameras as he leaves the club, while his gal pal sported a more serious expression.

The news comes amidst the reports that Bieber is secretly hooking up with the eldest Kardashian since August. The two were rumored to be together on Dec. 11, Friday when they first partied at the club before heading back to The Montage hotel in Beverly Hills, where the singer usually stays when he is in town. Kardashian allegedly left the place at around 4:00 am.

Bieber further fuelled the rumor when he posted a cryptic pic on Instagram showing him facing towards a woman who is leaning on a luxury car while her face is conveniently hidden from the camera. Since the singer captioned the pic as "Lord knows," it was rumored that the woman in the pic is actually the mother-of-three.

"Justin and Kourtney have been hooking up since late August, early September," a source told Us Weekly who further added that Kardashain's ex Scott Disick believes that she is doing all this to "get back at him and get revenge" and does not "believe that it is real."