On Sunday night, every famous person you can think of stepped out to walk the red carpet at the Oscars and its after parties. If there's one night of the year to call in something couture or take a fashion risk, the Academy Awards is it, and many of our favorite celebrities rose to the occasion. From sheer lace to sexy cutouts to superhero-like arm gear (we're looking at you, Sienna Miller), there were plenty of ensembles that had us talking. Here, take a look at some of our favorite looks from the most exclusive soirées of the year. Which ones are your favorites?