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New couple alert? Kourtney Kardashian sparks Justin Bieber dating rumors after they were spotted on a dinner date at The Nice Guy in West Hollywood on Friday night, December 11. In a video obtained by X17Online, Corey Gamble could be seen escorting Kourtney and Justin into a black waiting car outside the club.

Kourtney bared her cleavage in a plunging white jumpsuit paired with pointy heels and a white bag. Justin, meanwhile, sported a blue hoodie paired with an orange tee, black trousers and shoes. The pair then headed to Sushi Roku.

A source told Gossip Cop that Kourtney and Justin have been "casually hooking up." Their unexpected romance is reportedly not serious but occurs occasionally and they're both just having fun.

That night, Justin posted a picture of him posing in front of a blue sports car, which was previously parked in front of the black van he and Kourtney were riding. "Honestly im not trying to show off!! I am so proud and grateful of the things that I have been blessed with and don't take it for granted," he wrote alongside the snap, "I feel so blessed that I STILL get excited and ask my friends to take a picture of me with it.. Never think I'm trying to throw it in your face !!"

Honestly im not trying to show off!! I am so proud and grateful of the things that I have been blessed with and don't take it for granted. I feel so blessed that I STILL get excited and ask my friends to take a picture of me with it.. Never think I'm trying to throw it in your face !!

A photo posted by Justin Bieber (@justinbieber) on Dec 11, 2015 at 8:03pm PST

This is not the first time Kourtney was spotted hanging out with Justin. Back in October, Scott Disick's baby mama was seen leaving The Nice Guy together with the "What Do You Mean" crooner. They later went to Universal Studios' Halloween Horror night together. Kourtney also attended Justin's post-AMAs party last month.