Looks like things between Justin Bieber and Kourtney Kardashian are really heating up! The reality star was spotted leaving the ‘Sorry’ singer’s hotel room at 4AM on Dec. 12 and we couldn’t help but notice that something was clearly missing: her BRA! See the photos below!

Sorry Kourtney, but we’ve caught you red-handed! The 36-year-old reality star was spotted leaving the exact same hotel that Justin Bieber, 21, is known to stay at after partying with him in the early morning hours of Dec. 12, and upon further inspection, we couldn’t help but notice that something was a bit off when she left him — she was completely braless! Though she was spotted in one earlier in the evening, it appears Kourtney may have let loose later in the night, thus adding a whole new dimension to these crazy hook-up rumors. See the evidence for yourself below!

Ok, so let’s break this down. Rumors started swirling on Dec. 12 when a solo Kourtney was spotted leaving The Nice Guy in LA — the same club that Justin had been partying at that night, according to TMZ. While making her way out of the celeb-hotspot, Kourtney was spotted rocking a plunging white jumpsuit and what appeared to be a rather complicated looking halter bra with criss-crossing straps that peeked out from underneath. From there, the mother-of-three then made her way to the Montage Hotel in Beverly Hills, widely known as Justin’s favorite place to stay in the city. NOW CLICK HERE TO SEE KOURTNEY’S BRALESS PICS!

Now, here is where things get interesting. When Kourtney was spotted leaving the hotel, at 4AM no less, it appeared her bra was no longer intact! The hot mama was still rocking her original jumpsuit, but those distinct bra straps were clearly missing. Now, is it possible that Kourt just happened to stop by that particular hotel that night and decide to switch up her bra to a strapless style, sure. But it’s definitely a little suspicious.

Kourtney Kardashian & Justin Bieber ‘Hooking Up’ — He’s Proudly Telling Friends About It

While Kourtney has yet to speak out on her possible new romance, the Biebs has apparently been bragging all over town about the steamy affair. “Justin bragged to friends recently that he has been hooking up with Kourtney Kardashian,” a source told US Weekly. “Oh yeah, that’s definitely happening and has been for some time now,” a second source told the mag. “Every time Kourtney and Justin are together they’re extremely flirtatious. They text each other all the time.”

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This also isn’t the first time the two have been spotted out together. In October, they were also spotted leaving The Nice Guy together late at night. Then last month following the American Music Awards, she was spotted tumbling out of Justin’s after party! This may not prove that they are hooking up, but it definitely proves that they are close and like to spend time together.

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HollywoodLifers, do you think Kourtney and Justin are really hooking up? Tell us in the comments!