Even before her bottom won millions of fans in that Alexander McQueen bridesmaid’s dress, Pippa Middleton was a celebrity in London. As the most raucous of the Middleton girls, Pippa’s style is anything but rowdy: She prefers simple styles, favoring trim wrap dresses, perfectly fitted jeans, and short jackets. Like her sister, she almost always appears perfectly made-up and well tanned, but since she’s not married to a prince (yet!), she’s got a little freedom to add a bit of leather, cleavage, and edge to her look. Click ahead to see the famous sister and new author’s style evolution.