Kendall Jenner and Kylie Jenner
Ages: 16 and 14
Growing up too fast? Here, Kendall and Kylie arrive in incredibly sexy matching bootie-shorts at 102.7 KIIS FM's Wango Tango at the Home Depot Center in Carson, Calif., in 2012.
BING: See Kendall and Kylie at Wango Tango
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