Grammys '06 Best & Worst Dressed

See who hit fashion high notes (Beyonce! Gwen!) and who fell flat on music's biggest night – then vote on the looks. By Serena Kappes

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CHRISTINA AGUILERA: BEST

The pop diva (nominated for "A Song for You," with Herbie Hancock) channels old-school glamor in her sexy satin Roberto Cavalli frock and Veronica Lake-inspired tresses.