Good body language means making your body parts speak the right way. Some part-by-part tips:
Chin: To avoid a double chin, hold your head up high and try this trick: "Touch your tongue to the roof of your mouth," says Messina. "I don't know why, but it works!"
Stomach: Turn your torso toward the photographer at a 45-degree angle—it's an instant waist-shrinker.
Arms: Going sleeveless? Keep your arms bent and pulled slightly away from your body; holding them flat against your sides adds heft.
Legs: Renaissance painters often posed subjects contrapposto, with most of their weight on one leg. "It gives you a more relaxed, curvaceous look," says L.A.-based photographer Jasmine Star.
Hands: Remember that 30 Rock episode when Jack had to clutch a mug when he was on TV because he didn't know what to do with his hands? Same concept: Hold onto a bouquet, veil, your dress, a hip—or your husband's hand.