Credit: Brian Prahl/Splash News Online
Published: Wednesday January 16, 2013 06:00 AM EST
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OH, BABY!
"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.