Peplum skirts and dresses invaded the runway in a major way, last spring (Jil Sander, anyone?). And now, it looks like the super-flirty trend is here to stay for yet another warm-weather season — and maybe even through fall '12. Except, this time, it's coming in easier-to-wear separates, including one must-buy piece for spring '12: the mega-hot peplum top. Super simple to throw over a sleek pencil skirt or a slouchy pair of trousers, this silhouette-altering piece comes in two versions: the middle-cinching sex-kitten option and the cool, drop-waisted style that swings around your hips. Take a look at our tip-top favorites on the market right now, and pick your poison!