Screen Actors Guild Awards 2013

SAG 2013 Style: Sexy & They Know It

The evening's must-have accessory? For Michelle Dockery, Jessica Chastain and these other sultry stars, it was décolletage, which was put on (nearly) full display on the red carpet

JESSICA CHASTAIN

Her Alexander McQueen creation took our breath away … and it looks like it took away hers too. The Zero Dark Thirty star flaunts what she's got in a really tight (make that really, really tight) red sweetheart gown.