Kim Kardashian may have been the birthday girl on October 21, but it was her daughter North West, 8, who was the true star of the evening. In the late hours of her 41st birthday, Kim shared an adorable video on her Instagram Stories of an at-home “party” that her children — which include North, Saint, 5, Chicago, 3, and Psalm, 2 — threw for the SKIMS founder.