Justin Bieber and Kourtney Kardashian "were inseparable" during a night out last week, a source told PEOPLE
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Another day, another round of speculation surrounding Justin Bieber and his female acquaintances!

Just a day after a source told PEOPLE that Bieber and Kourtney Kardashian were "inseparable" and "super touchy-feely" during a night out at The Nice Guy in West Hollywood on Friday, the singer hit up the celebrity hot spot – but this time, Kardashian’s sister Kendall Jenner was also in attendance.

Bieber, 21, and Jenner, 20, arrived separately, with the pop star stopping by straight after his performance on The Voice finale Tuesday night, a source tells PEOPLE.

According to the source, Bieber performed “Sorry” on the piano and though he and Jenner “interacted a bit” it was “just as friends” and they “were more chill.”

The two also left separately, and Bieber was all smiles as he made his exit with a few friends, when another source says he headed to 1 OAK.

While Bieber has made no comment about his current relationship with Kardashian, 36, he and Jenner have long been close: The two spent Coachella weekend together earlier this year, and Bieber celebrated Jenner’s birthday with her and her family at The Nice Guy last month.

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Bieber has also palled around with Kardashian’s family in the past, posting a photo of himself in May swimming in a pool with Kardashian’s son Mason, 6.

“Mason is as cool as a fan,” he captioned the photo.