It was a family affair!

Kim and Kanye threw daughter North West a birthday party at Ruby's Diner in Calabasas last night, and the majority of the K clan came along for the fun! Is anyone else surprised that they opted for such a low-key venue? We assumed they'd go to Nobu or something!

Kimmy K dressed down for the occasion in sweats and a tank with no bra, while Yeezy and Kourtney followed suit in comfy clothes. Kylie wore jeans and a bodysuit, but it was little Nori that stole the show in her Snoop Dogg dress and furry slides. Two people noticeably missing? Rob Kardashian and Scott Disick. Maybe they didn't get invites?

The 4-year-old was gifted tons of presents, including a new bicycle, and it seems like everyone had a great time!