GALLERY: Click the image above to view more images from London Fashion Week.

Pippa Middleton has committed the cardinal (or shall we say carnal?) sin of front row style. During the Alice Temperley show at London Fashion Week, Pippa donned an Alice Temperley “fan dress" that retails for $1,745. Unfortunately, it was difficult to notice the dress when other assets were visible.

While standing, the Temperley London dress fell three inches above Pippa’s knees. When seated, however, the dress gave photographers an eyeful of thigh and caused the blogosphere to question whether the sister of Catherine, Duchess of Cambridge chose to forgo underwear.

U.S. Vogue magazine editor Anna Wintour often opts for skirts that fall below the knee, such as this piece she wore to the Derek Lam Spring/Summer 2012 collection show during New York Fashion Week Sept. 11, 2011. (KENA BETANCUR/REUTERS)