10 Most Stylish Stars

From the always chic Nicole Richie to the much improved Ashlee Simpson – check out the top fashion icons of 2005, as selected by PEOPLE style expert Susan Kaufman. By Emily Fromm

SIENNA MILLER

Miller's favorite things include her Burberry boots (left and center) and mod Balenciaga jacket (left). "She loves certain accessories, and doesn't feel the need to change them every day," says Kaufman. On the red carpet (in John Galliano for Dior), "she wears couture, but her hair's a little messy – she's never going to be that perfect, polished glamor girl. She never looks manufactured."