Last Night's Look: Love It or Leave It?We can't stop talking about Rose Byrne's printed sheath, the Duchess's tartan coat dress and more outfits that stars were just spotted in. Check them out, then vote – fashion-forward or fashion fail?

AVRIL LAVIGNE

The singer takes the moto jacket trend into dress territory with her formfitting black asymmetrical-zip mini at the Y100 Jingle Ball in Miami.



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