The Fashion Choices at the SAG Awards Deserve 5 Stars

Jennifer Aniston definitely isn't turning down the '70s vibe anytime soon. The star went from rocking flared pants to a golden vintage Galliano dress from the designer's Spring 1998 collection. She played up its plunging neckline with a long chain necklace by Amrit and opted for earrings and a bracelet by Fred Leighton.

Emma Stone left our mouths agape in her tailored Dior Haute Couture number. If for a second you thought she was going for a plain Jane look, just check out the sheer train on her dress. Emma herself seemed just as amazed by the design: "Somehow they made it come to life in the way that it looked on paper," she said. The star completed her look with Repossi jewels and Christian Louboutin pumps.

One thing's for sure: Lupita Nyong'o knows how to have fun with fashion. The actress showed off her gorgeous graphic-print Elie Saab dress, which she played up with dangling Fred Leighton earrings.

Keira Knightley flaunted her baby bump in a deep purple Erdem number, which was sporty meets feminine with layers of floral detail. She completed her dress with a surprising statement ear cuff by Repossi.

Reese Witherspoon opted for an all-white look in a custom Giorgio Armani one-shoulder dress, completing her look with Harry Winston and Tiffany & Co. jewels.

Julianne Moore was daring with color in her jaw-dropping Givenchy couture number and circular Chopard earrings.

Rosamund Pike definitely knows how to make a statement in all black! The star's puffy Dior Haute Couture statement dress looked effortless and luxe, and she smartly accessorized with simple black heels and Fred Leighton jewels.

Felicity Jones was soft yet powerful in a pale pink Balenciaga number. She completed her look with Van Cleef & Arpels jewels.

Naomi Watts's look was all about the detail, from the band of beads that embellished her Balenciaga dress to her statement clutch and chunky Bulgari bracelet.

Emilia Clarke may have chosen a simple off-the-shoulder Donna Karan Atelier gown, but she played up her striking navy-meets-black look with gorgeous Cartier jewels and Jimmy Choo shoes.

Sofia Vergara knows what works for her! The Modern Family star chose a one-shoulder Donna Karan Atelier dress that accented her flawless figure.

Rashida Jones's black-and-white floral Emanuel Ungaro dress was nothing if not striking with the sky blue piping detail that completed her plunging neckline. She finished her look with Norman Silverman jewels.

Claire Danes decided to make a statement in a Marc Jacobs dress that felt "different" for the star. We think she pulled off the intricate design, no question, completing her ensemble with Christian Louboutin shoes and Norman Silverman diamonds.

Sarah opted for a Vera Wang gown with a plunging neckline and beading inspired by the designer's Spring '15 collection. She completed her look with jewels by Lorraine Schwartz.

Camila let her plum Donna Karan Atelier dress take center stage. She didn't need many accessories to complete this elegant ensemble.

Eddie Redmayne looked spiffy in his sleek black Prada suit, smartly accessorizing with a Chopard watch and bow tie.

Natalie Dormer's SAG Awards look was totally whimsical. Her satin floral-print one-shoulder Naeem Khan gown was completed with Kimberly McDonald jewels.

We loved the delicate lace sleeves on Julia's Monique Lhuillier column gown.

Maisie Williams's strappy red dress was fun and flirty. We love how her surprising gold pumps played up her look.

Julia Roberts opted for pants on the red carpet! Though she may have been in all black, the star looked gorgeous in a Givenchy jumpsuit and Tiffany & Co. jewels.

Jared Leto didn't disappoint his fashion fans, playing up his black tux with pink accents: a rose pin and bright socks, which peeked out from beneath his embellished loafers.

Amy Poehler turned up the glitz and the glam in a shimmering navy Jenny Packham dress and Effy jewelry.

Joanne chose a structured, strapless Honor gown, which she played up with a Salvatore Ferragamo clutch and an eye-catching Jacob & Co. cuff. Of course, we're not surprised she looked stunning — the actress was styled by Brad Goreski!

Emmy Rossum had a princess moment in her intricate strapless top and skirt by Giorgio Armani, completing her ensemble with Cartier jewelry.

Meryl Streep's sophisticated all-black Lanvin look was finished with simple gold jewelry by Fred Leighton, black tights, and smart pumps.

Matthew McConaughey's satin black and blue suit made a major regal statement on the red carpet.

Maggie Gyllenhaal chose a long-sleeved Thakoon number, which included a sheer peekaboo detail in the center.

Sophia Bush opted for a dress the color of the carpet and still managed to stand out. From the sweetheart neckline to the flash of leg, Sophia's satin Vivienne Westwood number spoke volumes. If that weren't enough, she completed her look with eye-catching Irene Neuwirth jewelry, Stuart Weitzman shoes, and an Edie Parker clutch.

Kaley Cuoco's red strapless column dress was cinched at the waist with a bow, but her accessories — a metallic clutch and statement jewels — also helped to complete her look.

Viola Davis chose an all-white halter silhouette by Max Mara, completing her look with a Sidney Molepo bag and Van Cleef & Arpels jewels.

Real-life BFFs and Orange Is the New Black costars Laverne Cox and Danielle Brooks looked elegant on the red carpet. While Laverne chose a Johanna Johnson gown, Stuart Weitzman heels, Forevermark diamonds, and a Judith Leiber clutch, Danielle was dressed in a navy Christian Siriano number.

Uzo Aduba was a vision in a long yellow Angel Sanchez gown and Forevermark jewels.

Taryn Manning's sleek peach Elisabetta Franchi dress was playful yet sophisticated.

Natasha Lyonne played with shimmer in a two-toned dress and Fred Leighton jewelry.

Downton Abbey actress Laura Carmichael wore a white Spring '15 Vionnet halter dress and accessorized with Stuart Weitzman heels and dangling pearl earrings.

Orange Is the New Black star Dascha Polanco went for a formfitting high-neck gown and completed her look with eye-catching drop earrings.

Julie Bowen made us want to fast-forward to Spring in an intricate beaded floral number by Georges Hobeika — which was cinched at the waist with a dainty bow — and Effy Jewelry.

Ariel Winter flaunted her figure in a stunning Zac Posen number.

Sarah Paulson looked sleek and modern in a black-and-white Armani Prive colorblock dress, David Webb jewels, and Brian Atwood shoes.

Julianna Margulies chose a cobalt blue Giambattista Valli Couture dress, showing off a flash of leg and black T-strap Jimmy Choo heels.

Veep actress Anna chose a two-toned look. Her red Escada gown was complete with an eye-catching silver bodice, Paul Andrew shoes, a Jimmy Choo clutch, and Solange Azugury Partridge jewelry.

Lenny Kravitz made an appearance on the red carpet in all black. And there's nothing that screams "rocker" more than his cool-guy shades. Are we right?

Amanda Peet opted for a surprising shade of purple in a strapless J. Mendel dress, completing her look with a Judith Leiber Couture clutch.

Paula Patton chose a white beaded Aiisha Ramadan number, matching her golden clutch and Kimberly McDonald jewels perfectly.