Kim Kardashian & Mason's Most Precious Moments

She's a natural! See the mom-to-be showing off her maternal instinct with her sweet nephew


"Khloe, Kendall, Kylie and I are officially aunties," Kim Kardashian wrote excitedly on her blog when sister Kourtney welcomed son Mason Disick on Dec. 14, 2009. Here, the reality star gives her 3½-month-old nephew a lift on an April 2010 family vacation in Miami.