Kourtney Kardashian ditches her blonde hair and goes back to brunette declaring: 'brunette4lyfe'

Kim Kardashian showcases her sculpted arms while promoting the SKIMS summer pop-up in New York City

Kim Kardashian on Crying Herself to Sleep as a Mom

Kim Kardashian Discusses Emotional Challenge of Being a Single Parent, Recalls Crying Herself to Sleep Some Nights