Kourtney Kardashian and Scott Disick may have split up nearly two years ago, but they still have fun with one another.

On Tuesday, the parents of three celebrated Kourtney's 38th birthday at Disney California Adventure in Anaheim, California, and were feeling adventurous. The two were spotted front-and-center on the California Screamin' roller coaster, one of the fastest rides at any Disney theme park.

WATCH: Kourtney Kardashian Celebrates Turning 38 in Her 'Birthday Suit' -- See the NSFW Pool Pic!

While Scott and Kourtney clearly enjoy one another's company, a source told ET in January that "there has been no chance of reconciliation for quite some time now."

The source added that the reality stars have mastered co-parenting their children, Mason, 7, Penelope, 4, and Reign, 2. "Kourtney and Scott do an incredible job of co-parenting and truly are unmatched when it comes to putting on a strong front with the kids," the source explained. "They never discuss any of their issues in front of the kids."

WATCH: Scott Disick Calls Kourtney Kardashian the Love of His Life, Khloe Says the Two 'Kissed'

Scott didn't post anything on social media about Kourtney's big day, but her family was quick to send birthday wishes. "Happy birthday to the Milly to my Vanilli @kourtneykardash," Khloe Kardashian, 32, posted to Instagram, along with a video montage of her sister.

Here's a look at what Kris Jenner, Kim Kardashian West and Kendall Jenner shared in honor of Kourtney:

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