Metallic shades may have been the color of the night at the Met Ball, but when it came to dress silhouettes, flirty peplums took center stage at the fashionable affair. The Spring 2012 runways were filled with these feminine shapes, so it's no surprise that a bevvy of stylish celebrities opted to try out this flattering trend. From January Jones's more subtle architectural peplum to Elizabeth Banks's dramatic version, we saw peplums in all different sizes and proportions last evening. Watch today's Fab Flash to see for yourself! On Allison McNamara: Topshop peplum dress.