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Sideswept Hair, Tine Fey, Amanda Seyfried, Jessica Chastain, Naomi Watts

Kevork Djansezian/Getty Images; Dimitrios Kambouris/WireImage; Matt Sayles/Invision/AP

Call it a sweeping trend: Some of the biggest names at tonight's SAG Awards showed off a simple yet sexy style by keeping their long hair loose—and to the side! 

Tina Fey rocked a dramatic side part that married retro with modern, while awards season contender Jessica Chastain let her coppery red hair take center stage in a similar way.

Meanwhile, Cosette-turned-coquette Amanda Seyfried used her sideswept hair to show her sultry side in a strapless Zac Posen.

And Aussie beauty Naomi Watts brought us long, loose waves reminiscent of another blond Hollywood legend: Veronica Lake.

If there's still any doubt that sideswept hair is a new trend, take note of the biggest red carpet fashionista of all, Jennifer Lawrence, who also paired her midnight Dior gown with long locks flowing over one shoulder.