The Best & Worst Dressed at the 2012 Screen Actors Guild Awards

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Michelle Williams graced the SAG Awards red carpet in Valentino'ssignature color: red. She continued to sport her bronze pixie cut thatmakes every red carpet ensemble effortless. A delicate lace decolletageadded to the dresses elegance.

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Emma Stone rarely fails to impress us on the red carpet. The Help star stepped out at the SAG Awards in a tea length Alexander McQueen dress with a lacy bust. A sleek French Twist and rosette-adorned accessories were the perfect finishing touches to her modern take on '50s style.

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No red carpet affair is complete without Lea Michele sauntering! This girl lives for the arrival scene. She followed her statement Marchesa gown from the Golden Globes with this knock-out smoky gray Versace number. Wonder if she stretches out before she starts posing.

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Sofia Vergara can make any dress a masterpiece. She breathed new life into the basic silhouette of this magenta Marchesa gown. It may not rival the perfection of her Vera Wang number from the Golden Globes, but that may be an impossible task.

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We have to hand it to Angelina Jolie for making black look exciting time and time again. Here she is in this shimmery and clingy cowl neck Jenny Packham gown. Smoky kohl-lined eyes and vintage hoops were the perfect exotic additions to this sizzling style.

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If anyone can rock a jumpsuit on the red carpet, it's the always gorgeous Rose Byrne! She selected a dazzling white Elie Saab number with a tasteful neckline plunge. Almost more notable was her newly cut bob, making this look refreshingly avant-garde.

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And may we now draw your attention to Jayma Mays and her lavishly beaded Reem Acra gown. She may stick to cutesy looks on Glee, but the actress was seriously sexy in this lace back dress, which definitely put her finer attributes on display.

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It's no great mystery why Dianna Agron relies on Carolina Herrera's feminine designs. For the SAG Awards, the Glee star selected a lovely berry dress with ruffle accents. A braided updo (the hairstyle of the night) lent the look a slight goddess vibe.

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We hardly recognized Ashley Simpson. Maybe because we haven't seen her in a while, or perhaps because of the transformative powers of a Jenny Packham gown. She joined her beau, Vincent Piazza, for the occasion and the two lovebirds gushed to Giuliana Rancic about their eight month romance (aww!).

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Jessica Chastain added a powerful pop of color to the carpet with her cerulean blue gown. The corset dress was not only flattering (Calvin Klein's specialty) the rich hue made us do a double take in a sea of gray and pastels.

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We may not be warming to her gray 'do, but Kelly Osbourne's SAG Awards style made up for it. Gotta hand it to her (or her stylist) for choosing this white waist-whittling Badgley Mischka gown with a tasseled belt. Stunning!

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John Krasinski is one lucky man! He and wife Emily Blunt hit the awards in equally stunning style. While he looked dapper in a classic tux, she turned heads in this jade green chiffon gown, the perfect color for her porcelain complexion.

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Given how outstanding Zoe Saldana looked in Givenchy couture at the 2010 Oscars, it's perhaps no surprise she once again turned to the design house for a knockout red carpet gown. If anyone can rock an unusual look like this metallic silk organza dress with sheer netting, it would have to be the sartorial risk taker.

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Giuliana Rancic looked better than ever in a crimson Basil Soda gown. The intricately embellished dress was made all the better by a well-chosen gold statement necklace and matching belt.  And those Farrah Fawcett curls are quite fetching, no?

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And this, ladies and gentlemen, is how a teenager steals the red carpet show. Ariel Winter looked delightful in this Collette Dinnigan frock. The starlet teamed the gray lace dress (check out the detailing) with glittery Miu Miu heels and a goddess braid.

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StyleBistro Guest Editor Maria Menounos played up her curves in this sizzling black Dolce & Gabbana gown. Satin is notoriously unflattering, but thanks to a well-constructed corset and Maria's fab figure, the dress played up all the right areas. Tousled curls and seriously smoky eyes added to her sexy vibe.

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Diane Lane was the picture of red carpet elegance in this single shoulder David Meister gown. It looked kinda serious so she gave the cascading ruffle dress a youthful twist with a high bouncy ponytail. Fun!

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She wowed us at the Peoples Choice Awards, but Kaley Cuoco took our breath away at the SAG Awards. The Big Bang Theory star's strapless mint Romona Keveza gown with a rosette-adorned skirt was pretty spot on. And: relative to her sometimes wacky red carpet hairstyles, her braided updo was the right choice.

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Octavia Spencer loves her some Tadashi Shoji! She made her appearance in this silver beaded gown paired with an oh-so-chic top knot.

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Pastels ruled the red carpet at the SAG Awards! Case in point: Julianna Margulies' appliqued column dress. Calvin Klein isn't famous for these rich textures, but the minimal silhouette and muted hue seems so right for this red carpet event.