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Kylie Jenner

Was this a clue? Kim posted this Costa Rica throwback picture in early September of Khloe, Kylie and herself during their January 2017 Costa Rica trip

Kendall Jenner, Kylie Jenner

Sister Act from Kylie Jenner's Best Looks

The Unexpected Accessory Our Favorite It Girls Are Rocking: Usually when we spot a must-have item, it's more of a want than a need.

The Unexpected Accessory Our Favorite It Girls Are Rocking

Pin for Later: 37 Times We Dropped Everything to Obsess Over Kendall Jenner's Street Style Outfit She Treasures Her Favorite Outfit Accoutrements . And wears them frequently. Like this double-buckle B-Low the Belt waist-cincher.

As the pair debuts their newest holiday collection, we take a look back at Kylie and Kendall Jenner's summer Topshop campaign:

Kendall & Kylie for Topshop: The Lookbook