Rob turned 29 on St. Patrick's Day last week and was the guest of honor at a holiday-themed bash attended by most members of his family.
Kim and many of her sisters posted photos and videos from the bash on social media. In a Snapchat video, she and North, 2, are seen sitting together, all decked out in metallic green party tiaras, with the little girl grinning from ear to ear. The camera then pans to Kanye, who sports an even bigger smile.
"Cheese!" Kim says, which North then repeats.
Another one of Kim's Snapchat videos shows North sitting on Kanye's lap as she and her cousin Mason Disick, 6, blow into party blowout horns. The clip is captioned, "Annoying Alert."
Both North and her mom also sported green party glasses.
In addition to Mason, family pics and videos also showed several of Kim's sisters, including Kylie Jenner, 18, and Kourtney Kardashian, 36, her ex Scott Disick, 32, their daughter Penelope Disick, 3, mom Kris Jenner, 60, her boyfriend Corey Gamble and Kylie's beau Tyga, 27.
"The Lord is not pleased," Kourtney joked about Scott on her own Snapchat. "He's in a very bad mood."
The guests enjoyed birthday cake decorated with an image of Rob as a child, as seen in a photo Kylie posted on her Snapchat.
"I told them to cut me Rob's face," she joked.