PHOTOS: Happy National Sister Day

<div class="meta image-caption"><div class="origin-logo origin-image none"><span>none</span></div><span class="caption-text">In honor of National Sister's Day today, check out some celebrities and their sisters; Kim Kardashian, Khloe Kardashian and Kourtney Kardashian (Photo/Omar Vega)</span></div>
Did you know that the first Sunday of August is National Sister Day? Check out photos of some famous sisters!
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