The 36-year-old reality TV star kept up her recent tradition of showing off her toned bod, hitting the swanky restaurant-lounge in a body-hugging beige top, white skinny jeans and strappy black heels, while Bieber wore an army green hoodie, camouflage jacket and gray baseball cap.
An eyewitness tells ET that although the two arrived to the celebrity hot spot separately, they left together through the back door and hopped into Bieber's black Escalade.
They then headed to Universal Studios Hollywood Horror Nights with three girls, according to the source.
An onlooker tells ET that at the theme park, Bieber was walking with his arm around Kardashian and joking with her about being scared. The two spent about an hour and a half together at the park, going through several haunted mazes including Crimson Peak, The Walking Dead and This Is The End, before heading to the Saddle Ranch Chop House restaurant at Universal CityWalk.
Bieber later took to Instagram to share a black and white photo of the two inside the This Is the End 3D maze.
This isn't the first time Bieber has been linked to the Keeping Up With the Kardashians clan. Earlier this year, there were rumors that the 21-year-old singer was reportedly dating Kardashian's younger sister, Kendall Jenner, after the two posed together in a Vogue photo shoot and Bieber posted flirty photos of the two to his Instagram. Bieber also defended Kylie Jenner after she was slammed for posting a selfie of herself sporting cornrows. He's also a neighbor of the Kardashian's in Calabasas, California.
The newly-single Kardashian called it quits with her on-again, off-again boyfriend, Disick, over Fourth of July weekend after he was spotted with another woman, his ex-girlfriend Chloe Bartoli. Disick and Kardashian were together for nine years and share three children together, Mason, 5, Penelope, 3, and Reign, six months.
Most recently, the 32-year-old father has been linked to 18-year-old model Lindsay Vrckovnik. The two have been spotted multiple times in both New York City and Miami, Florida, not exactly going undercover with their reported relationship.
It doesn't seem like he's completely moved on from Kardashian, however. On Thursday, he re-posted a nude photo from her Vanity Fair shoot, captioning the pic, "Now that’s 1 hot mama."
Watch the video below for more on Kardashian's sexy shoot with photographer Brian Bowen.