90 Reasons to Celebrate Mary-Kate and Ashley's Style

Twinning combo: For the 2009 Opening Ceremony Japan opening reception party (phew, that was a mouthful), it was all about the accessories — lace ears, embellished bags, and killer shades, to be exact.

• Ashley jazzed up her black slip dress with chain-detail Prada sandals, cute mouse ears, and a rose-print Prada bag.
• Mary-Kate stayed true to her edgy style with a textured black mini, lace bunny ears, and an orange studded bag.