Don't be surprised if people can't stop commenting on your leaner silhouette—it's up to you whether you divulge these crunch-free secrets.
By Candace Braun Davison
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The "Have You Been Doing P90X?" Dress
This color-blocked style melts away pounds—or at least creates the illusion of it. The black band down the center widens just below your widest part, making your hips look slimmer, and the pale gray sides at the waist make your obliques look as toned as if you've spent a month doing Tony Horton's Ab Ripper X.