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The mom-to-be struck exactly the perfect balance between Hollywood glam and D.C. sophistication in this twisted Monique Lhuillier.
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Somewhere Natalie Portman is drooling over this perfectly gamine, meticulously embroidered Marchesa.
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Call it the anti-Effie: the Hunger Games star put a sleek foot forward in a stunning red Antonio Berardi.
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The Scandal star looked positively demure in a Calvin Klein column gown.
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Hudson certainly dazzled in this sequined Jenny Packham, but it seemed a little Tinseltown for a night out on the Beltway.
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The star played to both parties in a Pucci that featured a conservative cut but still showed a liberal amount of skin.
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Between her blonde hair, pale skin, and the pearlescent satin of her Vivienne Westwood gown, a pop of color would have helped Danes stand out.
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Like another expectant mom, the True Blood star stepped out in a sexy yet sophisticated black number.
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Showing them how it's done, Davis looked smashing in a single-shouldered satin gown.
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Who knew there was such a thing as adorkable evening wear? Leave it to the New Girl star to find a quirky polka-dotted Oscar de la Renta.
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It wouldn't be a red carpet without the A-list stylist and another of her signature long-sleeved '70s-style gowns.
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She may only be 18, but the Twilight star has clearly graduated from the kids' table with this beautifully beaded Prada gown.
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Holly Robinson Peete
Giving the little black dress a twist with beaded straps, Robinson Peete provides a lesson in what to wear when invited to a White House affair.
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We're oddly mesmerized by Dawson's iridescent and ombre-shaded gown — though we can imagine two other reasons people might have been staring.
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Right-wing, wrong dress. The troubled starlet wore a poorly stitched gown as a guest of Fox News pundit Greta Van Susteren.
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We're not sure what the swimsuit model was doing at a White House-affiliated event, but how handy that she brought her cover-up along.
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For once we missed the Modern Family star's usual mermaid gown, which may have been a little more appropriate for a night with the president.
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To the long list of ''What Was Kim Thinking?'' moments — her butt x-ray, a mayoral campaign, that wedding — we're adding this green velvet gown.
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Once upon a time, a star stepped out on the red carpet in H&M. No, really!
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The Parks & Recreation star can do no wrong in our eyes — though with this printed peplum number by Tory Burch she comes awfully close.