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.

Kevork Djansezian, Getty Images
Frazer Harrison, Getty Images