Kourtney Kardashian was spotted at the weekend hitting the town with ex-fling Justin Bieber. Bieber and Kardashian stopped by West Hollywood hotspot The Peppermint Club on Saturday night, shortly after the reality star left a birthday celebration for Jessica Alba‘s husband Cash Warren.


According to a Kardashian source to PEOPLE, she and Bieber "hung out together with friends, but didn’t spend the night together. Kourtney is still serious about making things work with Scott. She went to the birthday party for Cash first and was ready to party more after. They chatted, had fun but that was it. Kourtney is finished hooking up with Justin."

Kardashian bared all in a sheer black lace bustier and silk pajamas for Warren’s ‘pajama jammy jam’-themed birthday affair. Bieber decked a grey hoodie and baseball cap.