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Justin Bieber, Kourtney Kardashian

ROLO/AKM-GSI

Well, fancy this!

Kourtney Kardashian hung out with Justin Bieber on Friday night. The 36-year-old Keeping Up With the Kardashians star and mother of three and the 21-year-old pop star, who recently made headlines with some very NSFW photos, were photographed leaving the restaurant The Nice Guy in West Hollywood, California. She sported a nude tank top and white skinny jeans, while the singer wore a hooded camo jacket, black pants and white sneakers.

Although the two exited the restaurant together, they dined separately with groups of friends, a source told E! News. Bieber arrived later in the evening and gave a surprise performance on the piano.

Justin Bieber, Kourtney Kardashian

Holly Heads LLC / Splash News

Kourtney and Bieber were later seen together at Universal Studios Hollywood during one of its Halloween Horror Nights.

The "Baby" singer, a longtime Kardashian family friend, posted on his Instagram page on Saturday a black and white photo of the two at the theme park sporting what appear to be 3D glasses. 

An eyewitness tells E! News that the pair enjoyed several mazes including Crimson Peak, The Walking Dead and This is the End. 

Justin Bieber, Kourtney Kardashian, Universal Studios Hollywood - Halloween Horror Nights

Instagram

In fact, Bieber was seen walking with his arm around Kourtney and joking with her about being scared. They were later spotted at Saddle Ranch Chop House at Universal Citywalk.

Bieber used to be Kourtney's neighbor and has hung out with her kids and other members of her family, including Kendall Jenner, in the past.

In 2014, her sister Khloe Kardashian bought the home he used to own in Calabasas, California, right near Kourt and the houses of most of the rest of the Kardashian and Jenner family, and where the singer's famous Egg-Gate debacle occurred.

(E! and Universal Studios are part of the NBCUniversal family.)

—Reporting by Sara Kitnick and Mike Vulpo

Keeping Up With the Kardashians airs Sundays on E! at 8 p.m.!