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Democratic National Convention, August 2008

With the world's eyes on her, Michelle Obama chose a simply beautiful turquoise dress by Chicago-based designer Maria Pinto for the Democratic convention in 2008.

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Her red-and-black dress with a crisscross corset by Narciso Rodriguez attracted nearly as much attention online as Barack Obama's victory speech.

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The First Lady dazzled in a one-shouldered white silk chiffon gown embellished with organza flowers and Swarovski crystals at the 2009 inaugural balls in Washington, D.C., and made designer Jason Wu an overnight sensation.

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At a dinner for governorsthe couple's first White House black-tie eventMrs. Obama looked sparkly-chic in a strapless gown by Peter Soronen and a crystal-and-pearl necklace by Tom Binns.

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At an evening celebrating Stevie Wonder, who won the Library of Congress Gershwin Prize for Popular Song, FLOTUS wore an emerald-green silk chiffon dress by Kai Millathe musician's wife.

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A new kind of statement piece: Mrs. Obama looked chic in a marigold J.Crew cardigan and pencil skirt for a women's event. In the ensuing years, she'd also proudly wear pieces from Gap, H&M, and Target.

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She arrived in a pretty Tracy Reese floral for the President's three-day official visit to Mexico.

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The First Lady was the picture of polished-cool in a bronze polka-dot Kevan Hall shirtdress.

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When one wants to appear regal for a state dinner with Queen Elizabeth but still flash some shoulder, one wears an ivory Tom Ford dress with a crossover bodice, waistline ribbon detail, and a flowing chiffon skirt.

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The First Lady capped off the couple's visit to London with a fitted black, off-the-shoulder evening gown by Ralph Lauren.

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Few things are more stylish than encouraging youth to kick childhood obesity, as Mrs. Obama did when she started the Let's Move! initiative. Here she is, as David Beckham himself looks on, being a role model in a sporty outfit hours before the start of the London 2012 Olympic Games.

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She wowed in a fitted Tracy Reese pink toile dress with gold brocadeand blue trim, of course.

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Once again, Michelle Obama chose a Jason Wu gown for inaugural festivities, this one a stunning ruby chiffon and velvet number with cross-halter straps.

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A sunny $169 dress from Talbots kicked off a vacation in Martha's Vineyard, one of several Talbots pieces she was spotted in during her eight years in the White House.

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Her FLOTUS-ness rocked a teal chiffon Marchesa gown with off-the-shoulder allure at a gala for Kennedy Center honorees.

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The First Lady spoke at a luncheon at the L.A. museum in a Phillip Lim midi with a window-pane design.

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At the Phoenix Awards dinner, taking center stage in a graphic white gown with a pleated skirt by Bibhu Mohapatra.

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The First Lady made a lasting impression during her first visit to Japan in a vibrant flared Kenzo dress with a mirrored belt.

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Michelle Obama wore a marigold Narciso Rodriguez dress for the President's last State of the Union address; it sold out online before his speech was done.

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She addressed the crowd at the Phoenix Awards dinner in a strapless gold Naeem Khan gown with hand-painted gold leaf over black tulle.

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Read more:
Michelle Obama Made Another Surprise Awards-Show Appearance - Vanity Fair