Speculations are circulating online on whether Kourtney Kardashian, 36, and Justin Bieber, 21, are now romantically involved after they were seen together on a night out on Friday. Are they just hanging out or is this Kardashian's way of getting back at ex-partner Scott Disick?

The newly single "Keeping Up With The Kardashians" star and mom of three was photographed leaving The Nice Guy restaurant in West Hollywood LA, last Friday night, with Bieber close behind. They reportedly left the restaurant together in the same car, according to Daily Mail.

The night was long and full of Halloween fun for Kardashian and Bieber as they proceeded to the Universal Studios Hollywood Horror Nights with three other female friends, according to Mirror. They enjoyed going around mazes like "Crimson Peak," "The Walking Dead" and "This is the End."

Bieber was also seen "walking with his arm around Kourtney and joking with her about being scared," E! News reported. The pair was later glimpsed at Saddle Ranch Chop House at Universal Citywalk.

Kardashian looked fabulous in a cleavage-showing V-neck vest top, white jeans and black strappy sandals. The singer, meanwhile, was covered in a hooded camouflage jacket, black pants and white sneakers.

And Bieber did not let the night go without sharing the evidence of their delightful evening to his 40.8 million followers on Instagram. The photo was a black and white selfie, with both of them wearing what appear to be 3D glasses and Kardashian in a rather cute pose.

Although the Canadian pop star's friendship with the Kardashian family is no secret, followers were quick to spread rumors and comments about them dating.

According to Daily Mail, partying with Bieber might just be the reason for the very big smile on Kardashian's face when she was spotted in a shopping trip to Barneys with kids Mason, 5, and Penelope, 3, in Beverly Hills, Calif. on Sunday.