Stars rocked their sexiest looks on the Oscars red carpet and at the Vanity Fair afterparty, but we couldn't take our eyes off of Kate Beckinsale. The ageless actress didn't disappoint in a sleek black Reem Acra gown that featured sultry cutouts and beautiful crystal details. The form-fitting silhouette offered just the right amount of sex appeal with its cleavage-baring top. She completed the assemble with '70s-inspired Hueb diamond cluster earrings and satin Brian Atwood heels. We have no doubt this was one of her hottest looks yet. Take a closer look at the glamorous dress ahead.