We already know that Jessica Chastain can act her face off, but we were worried about her fashion sense for a second after the seafoam green sack she wore to the Golden Globes -- but she rebounded beautifully in a red-hot, straight and strapless Alexander McQueen gown at the 2013 SAG Awards.

Chastain wore a side part in her ginger locks, which fell in waves on one shoulder, showing off her dripping-with-diamonds necklace. She joked that she wanted to keep it toned down and not be too diva-esque when it came to her hair, since she paired a red gown with loads of bling. That was a smart choice.

Wow, wow and wow. This didn't photograph nearly as beautifully as it looked on the red carpet, but trust us -- Chastain was easily one of the best-dressed at the 2013 SAGs. Now we're dying to see what she'll wear to the Oscars.

Jessica Chastain 2013 SAG Awards
Kevork Djansezian, Getty Images
Jessica Chastain at the 19th Annual Screen Actors Guild Awards
Frazer Harrison, Getty Images