Pippa Middleton — who first drew our attention in a knockout, body-conscious Alexander McQueen dress at the royal wedding — is celebrating her 28th birthday. It's already been a big year for this Middleton sister, who's now invoking a bit of a fashion following, and with good reason. Pippa has a knack for casual styling, with a love of affordable labels like Zara and a down-to-earth accessibility that's made her one to watch. We're impressed with Miss Middleton's working wardrobe — a mix-and-match in tailored blazers, slick leather jackets, printed sheaths, and great neutral accessories. So, in honor of Pippa's big day, we're breaking down her styling tricks and celebrating with a look at some of her best looks. Click through to see how she does it.