Scott Disick and Rob Kardashian have discovered the secret to a lasting bromance: regular cuddle-fests.

Kim Kardashian took to her Instagram account recently to share an adorable photo of her younger brother and Kourtney's love fast asleep at the airport--with Disick's head resting on a pillow propped against Rob's thigh.

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"This is how I caught Rob Kardashian and Scott Disick at the airport passed out sleeping! LOL," the E! star wrote of the BFFs.

Last fall, Kourtney, Khloe, and Kim spoke to xojane about Scott and Rob's bond--and where Khloe's husband, Lamar Odom, fits into the equation.

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When asked if Rob and Scott have ever "hooked up," Khloe joked, "Only on Wednesdays."

"I wouldn't be surprised if they did," Kim chimed in. "I always say that."

"They're, like, obsessed with each other," Kourtney explained. Turning to her sisters, she asked, "What is that double kiss they do?"

PHOTOS: The Kardashian sisters as kids

"They love to kiss," Kim admitted.

"Rob and Lamar kiss [too]," Kourtney shared. "I don't know what it is about them. But I will say, Scott and Lamar are both only children, and Rob is basically an only child because he is a boy and we, like, don't talk to him. So maybe they're all so desperate for affection it's like their own little menage a trois."

This article originally appeared on PIC: LOL! See Scott Disick, Rob Kardashian Snuggle During an Airport Nap