(TMZ) - Looks like North West is down with Mom's new low-key approach to life, 'cause she got turnt for her 4th birthday party at a Ruby's Diner.

Yes, Kim and Kanye threw a family-only shindig Thursday evening in Calabasas. Grandma Kris Jenner and Kylie were there too, and looks like Nori opened gifts inside. She left with quite the haul, including a new bicycle.

Mom and Dad dressed down -- camo for Ye and sweats for Kim, but the bday girl definitely stole the show with a dress from Snoop Dogg's Spring line.

Fuh sheezy, North!

Photo: AOL