Justin Bieber and Kourtney Kardashian have been hit with dating rumors lately. So far, the pair has not done anything to stop the rumors from spreading.

Amid the speculations, they reportedly partied together on Friday, Dec. 11, at The Nice Guy in Los Angeles. Kardashian was later seen heading to Montage in Beverly Hills, where the singer was staying and left the hotel at dawn supposedly without her bra on.

According to TMZ, Kardashian left the hotel at 4 a.m. The site shared a photo of the "Keeping Up With The Kardashians" star leaving the hotel entrance. The 36-year-old looked happy when she was photographed.

However, Hollywood Life noticed one thing missing when she left the hotel. Kardashian is missing her brassiere. When she left The Nice Guy to head to the Montage Hotel, she was still wearing a halter-type bra as seen in this photo shared by Hollywood Life. However, she may have reportedly ditched her bra when she spent the night with Bieber in his hotel room.

Kardashian and Bieber, 21, have so far remained mum about the nature of their relationship. It's known the Canadian pop sensation is a close friend of the Kardashian clan and to sisters Kendall and Kylie Jenner.

Regardless, their little fling have supposedly made mom Kris Jenner thrilled for her eldest daughter. Jenner reportedly doesn't mind their age difference as long Bieber makes Kardashian happy.

However, there are people who do not agree with the pair's romance including Kardashian's ex-boyfriend, Scott Disick, Kendall and Kim Kardashian-West.

Disick is supposedly shocked to hear of the pair's romance and Kardashian-West is grossed out. Kendall is said to be confused. The Victoria's Secret model reportedly doesn't understand why her step-sister is infatuated with the "What Do You Mean" singer. A source told Hollywood Life in a separate report that Kendall finds their relationship "weird" and "creepy."

"First off, Justin is Kendall's good friend. He used to date her best friend Hailey [Baldwin]. Plus, he's just too young for Kourtney. He's a complete player and for the life of her, Kendall doesn't understand what Kourtney and Justin have in common. They both downplay their flirting with each other when they're around Kendall, but she's not an idiot. She knows something's brewing between them and it's just bizarre to her," the source said.