Courtesy Kourtney Kardashian
December 28, 2014 04:00 PM

Baby’s first Christmas was also mommy’s first night out for Kourtney Kardashian.

The reality star and designer made her first public appearance since giving birth to son Reign Aston, attending mom Kris Jenner‘s holiday bash Dec. 24.

The hot mama joined sisters Khloé and Kim Kardashian for a fierce, black-and-white picture in the party’s photo booth.

“Couldn’t imagine life without them. #sisters,” she wrote on Instagram.

The annual Christmas Eve celebration was also a milestone for Reign’s cute cousin, North West, who wasn’t exactly having a holly jolly time during her first encounter with Santa Claus.

Kardashian, 35, and longtime love Scott Disick, 31, welcomed their baby boy Dec. 14. He joined big brother Mason, 5, and Penelope, 2.

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