With killer gams. That's how Sienna Miller, Slumdog Millionaire star Freida Pinto, and most other fashionistas rock their booties. With short shorts, sassy tiered minis, skinny jeans, or leggings, booties are all about leg extension. Beware, though. They can stump you out if you go with a maxi dress/skirt, or a cut of pants that don't define your legs' silhouette.