Kim Kardashian wears black crop top taking Saint, 6, and North, 9, to birthday party: Photos

Kim Kardashian is a very involved mom. The reality star, 41, was seen taking her eldest son Saint West, 6, and North, 9, to a birthday party in Los Angeles on Saturday July 6. Kim wore a men's-inspired blue button-up that appeared to be from Umbra over the top of a black cropped top, likely from her own SKIMS shape and loungewear line. She added a pair of matching blue shorts on the bottom, keeping the vibe cozy with a sporty pair of black flip flops.

Kim's older sister Kourtney Kardashian, 43, also appeared to be attending the same birthday party with her daughter