Who's the Best-Dressed Star?

Weigh in on the style of Jennifer, Beyoncé, Jessica and 17 other celebs – then see who makes the top of the list in PEOPLE's Best & Worst Dressed issue, on newsstands Sept. 15. By Serena Kappes and Melissa Liebling-Goldberg

CHRISTINA AGUILERA

A modern-day pinup girl, the sultry songstress sticks to slinky gowns at night (left, in Roberto Cavalli) and flirty day wear Рand always her signature Christian Louboutin heels!