On Tuesday, two days after the bash, Khloé, who confirmed that she and NBA boyfriend Tristan Thompson are expecting their first child together, shared photo booth shots of her and Kylie, who covered up in a leather jacket.
While Khloé, 33, and siblings Kourtney Kardashian, Kim Kardashian West and Kendall Jenner posted plenty of memories from the Christmas Eve party with fans and followers, Kylie — who is expecting her first child, a baby girl, with rapper boyfriend Travis Scott — did not appear in any photos from the bash shared to social media. But a source told PEOPLE she was there celebrating away from the cameras.
Want all the latest pregnancy and birth announcements, plus celebrity mom blogs? Click here to get those and more in the PEOPLE Babies newsletter.
“Kylie looked great but didn’t really draw any attention to her baby bump,” the source said. “She still acts like she wants to keep her pregnancy private.”
Adding, “Everyone had the most amazing time. Kris always throws the best parties. It was all gorgeous. There was no drama.”
“Merry Christmas! People think you weren’t there last night,” Khloé said to Kylie in one Snapchat video as the younger sister replied: “I was.”
“She’s a secret little bunny,” Khloé teased.
WATCH: Khloe Kardashian Confirms Pregnancy with Boyfriend Tristan Thompson: ‘My Greatest Dream Realized’
Before the Christmas weekend, Kylie and Khloé previously co-starred in a Kylie Cosmetics YouTube video together, during which they discussed their Lip Kit partnership called In Love with the Koko Kollection.
“We created them. It’s our baby together, we have eight!” Kardashian proudly told Jenner, who responded: “We have so many babies, who knew?”
The sisters are all currently expecting — Kim will welcome her third child, a daughter, via surrogate — and an insider previously told PEOPLE they’re all prepping for their new additions.
“Khloé and Kylie are both starting to plan out their nurseries, and Kim and Kourtney are also involved in the process,” said the insider. “All the sisters are super excited, and Kris has been helping as well.”