Photos: Kourtney Kardashian spotted leaving Justin Bieber's hotel room by 4 a.m

Justin Bieber and Kourtney Kardashian are said to be hooking up as part of an ongoing casual relationship.

According to Gossip Cop, the pair had a rendezvous at The Nice Guy eatery in the West Hollywood area of Los Angeles on Friday, where they were both photographed..

"From there, they and a group of others went to a karaoke club called Blind Dragon. Kardashian left the karaoke joint well before Bieber, but that was not the end of their night. At some point, Kardashian headed over to the Montage Beverly Hills hotel, where Bieber often stays. She was later photographed leaving the hotel at 4 a.m."

The site claims this, however, isn’t Kardashian’s first hook up with Bieber. Back on October 10, the two also had dinner at The Nice Guy. They later took an Instagram picture of themselves in 3-D glasses at Universal Studios’ “Halloween Horror Nights” before spending time together later that night.

Kourtney leaving Justin Bieber's hotel room by 4 a.m