We Spy: Underbutt at Paris Haute Couture Fashion Week!

POPSUGAR Fashion is the ultimate source for what's new in fashion, hosted by Allison McNamara.

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olivia-palermo rosie-huntington-whiteley-celebrity kendall-jenner paris-haute-couture karlie-kloss runway-fashion versace underbutt dior high-fashion runway kristen-stewart julianne-moore popsugar-fashion fabsugartv celebrity-style celebrity-fashion what-to-wear diy-fashion street-fashion allison-mcnamara style-tips fashion-tips outfit-ideas haute-couture