Ah, la Parisienne and her air of effortless insouciance!
I discovered these instructions on the YSL Experience Parisienne blog last week (in circuitous fashion via the ever-inspiring Glamourous Grad Student). The messy Parisienne bun has since become my 'do of choice and I have been wearing it continuously for days.
The key is not having super-clean hair (pas de probleme pour moi, as I tend to wash mine only two or three times a week anyway).
I know that this looks laughably simple, but what makes it different from my usual twist-and-secure-without-thinking-about-it bun is 1. it sits high on the crown; 2. using hairgrips or pins instead of a hairband to achieve that authentically loose knot and 3. pulling tendrils from the hairline at the nape of the neck and temples to add an element of romantic disarray. Et voila!
Allez! Soyez jolies, mes petites!