Amid rumours of them casually dating, pop sensation Justin Bieber and reality TV star Kourtney Kardashian were "inseparable" on an intimate night they spend in West Hollywood.

The 21-year-old "What Do You Mean" hitmaker and the eldest Kardashian sister were spending some quality time together at one of the popular joints, reported People magazine.

"He and Kourtney were nearly inseparable - smoking on the patio together and were super touchy feely," a source said.

They went to Blind Dragon afterwards. Kourtney left around 12:45 am and Justin left around 1:30 am," the source added



Bieber has palled around with the Kardashian family in the past.

During summers he posted a photo of himself horsing around in a pool with Disick and Kardashian's son Mason.