We've talked about dresses and skirts, but I think the sexiest look is actually tomboy style. You feel comfortable and look beautiful, and you can can run around, be goofy and have a good time (without getting blisters from your heels!). What do you think? Doesn't Natalie Portman look gorgeous? (Even prettier than when she's dressed up, I think.)
A similar outfit: Gap shirt, $59.95; J. Crew sweater, $79.50; Lucky Brand jeans, $99; Burt's Bees lip balm, $2.