Kylie Jenner shared a kiss with her sister Kendall Jenner during the reality star's 31st birthday celebrations, a moment captured and shared by their sister Khloe Kardashian.

The video, posted to Khloe Kardashian's Instagram, shows the sisters posing for cameras before Kendall prompts Kylie for a kiss. "Kiss me! Kiss me!" Kendall exclaims.

Initially, Kylie appears to make faces at the camera before turning to give Kendall a brief kiss on the lips. Kendall laughs, appearing incredulous at the exchange. Online commenters reacted to the moment, with some finding it unusual and others joking about Kylie's demeanor before the kiss.

This display of family closeness comes as the Kardashian-Jenner sisters have continued to work together professionally. Kendall and Kylie, along with Khloe and Kourtney, recently appeared in a SKIMS holiday campaign for their sister Kim Kardashian's brand. The campaign featured the siblings in festive lingerie, posing with Santa.

Khloe Kardashian posted a lengthy tribute to Kendall on her birthday, reflecting on their sisterly bond and Kendall's personal growth. "There is something so beautiful about loving someone through every season of their life," Khloe wrote. "Getting to witness all the little pieces of who they are and watching them become the extraordinary person they were always meant to be."

She continued, "No matter how much life changes or how many chapters we live, there will always be a part of me that sees you as my little angel baby. And there will never be a version of this life where I’m not beside you, loving you, believing in you, and cheering you on."