Kourtney Kardashian's dating rumors with Justin Bieber have been making headlines following their latest sightings together. New reports claim that the 36-year-old mother of three and the 21-year-old "Sorry" singer are still hooking up, and the former is reportedly not really concerned about mending things with her ex-boyfriend, Scott Disick.

On Friday, Dec.11, Kourtney was seen partying with Justin at their favorite night spot, The Nice Guy in West Hollywood. Celeb Dirty Laundry calls the two an unlikely couple and claim that they spent time at WeHo before proceeding at The Blind Dragon for karaoke. Their outing spurred dating rumors at once, labelling Kourtney as a cougar as she is seeing the young pop singer.

Us Weekly's source claims, "Justin bragged to friends recently that he has been hooking up with Kourtney Kardashian." Meanwhile, another insider revealed that the two have been going out for a long time now. "Oh yeah, that's definitely happening and has been for some time now. Every time Kourtney and Justin are together they're extremely flirtatious. They text each other all the time."

The eyewitness goes on to say that Kourtney and Justin were flirtatious and they were spotted laughing and touching each other. Kourtney's dating rumors with Justin stepped up a gear when she was reportedly seen at The Montage Beverly Hills hotel where the "What Do You Mean" crooner was staying. The "Keeping Up With The Kardashians" star reportedly went out of the hotel at about 4 am.

This is not the first time that Kourtney has been rumored with the Canadian singer. The two were seen a couple of times hanging out at The Nice Guy. The Biebs was even seen babysitting Kourtney's three kids, Mason, 5, Penelope, 4, and Reign, 11 months.

What can you say about the latest news on Kourtney dating the much younger Justin?