President Obama and Mrs. O at the opening dinner of the G20 summit

President and Michelle Obama at the G20 summit opening dinner in Pittsburght. Photo: Jewel Samad, AFP/Getty Images

Last night, Pittsburgh was abuzz with some serious VIPs.

In this case, the stars were international dignitaries arriving for the G20 summit's opening dinner.

Not ones to disappoint, our very own national hosts, President and Mrs. Obama, stepped out looking modern as ever.

Michelle Obama donned a taupe and pink printed dress from one of her fashion favorites, Thakoon.

The spaghetti-strapped number featured a shirred fitted bodice -- baring the First Lady's toned arms -- and a long loose skirt that fell just below the knee.

Keeping it classy, the style icon topped off her evening ensemble with a single strand of pearls and pearl stud earrings.

michelle obama

Mrs. O's looks of the week. Photos: Creative Commons, White House Flickr | Rick Gershon, Getty Images | Jim Watson, AFP/Getty Images

The special night brought out the who's who of the political world including Prime Minister Hatoyama of Japan and his wife Miyuki, Russia's President Medvedev and wife Svetlana and France's stylish duo: President Sarkozy and Carla Bruni (who wore an understated black shift dress).

While many of the first ladies opted for covered-up skirt suits, which MO has been spotted in of late, we think this chic frock was a good call for the the affair.

What's your take? Is Mrs. O's Thakoon dress refreshing or should she have gone conservative in a more "official" outfit? Leave a comment below.

Michelle Obama has been mixing it up recently, from her signature cinched cardigan-skirt combos to polished Jackie O.-style suits. See more of the First Lady's trendsetting looks in the below gallery.,feedConfig,entry&id=458581&pid=458580&uts=1253898313
Style Evolution: Michelle Obama
The First Lady of fashion has certainly been a risk-taker when it comes to fashion. Click through to check out some of her best (and most talked-about) looks right here!
John Moore, Getty Images
New Line Cinema/Warner Bros. Pictures

Style Evolution: Michelle Obama

    Pittsburgh, PA, September 24, 2009
    First Lady Michelle Obama hosted a dinner party for the spouses during the G-20 Summit and wore a silk ruched Thakoon Resort 2010 frock - that showed off her chiseled physique - with a pearl necklace.

    John Moore, Getty Images

    Pittsburgh, PA, September 24, 2009
    Michelle Obama deplanes Air Force One in a sheer Diane von Furstenberg dress. The First Lady accentuated her sea green, tiered number with metallic flats.

    JIM WATSON/AFP/Getty Images

    New York, NY, September 23, 2009
    Embracing fall, First Lady Michelle Obama wears a burnt orange cocktail dress with a gathered waist and beaded bow embellishment to host world leaders at the Metropolitan Museum of Art. She accessorized her sheath with bronze heels and gold jewelry.

    U.S Department of State, flickr

    New York, NY, September 23, 2009
    En route to attend the United Nations General Assembly, Michelle Obama looks chic in a red silk cap sleeve jacket and matching skirt by Michael Kors.

    Rick Gershon, Getty Images

    During a trip to Martha's Vineyard in August 2009, Michelle Obama went casual in sky blue Crocs. According to the company, she's wearing the Malindi style--and they match perfectly with daughter Sasha's outfit.

    Alex Brandon, AP

    Michelle Obama wears a white sleeveless dress to dinner with President Obama at the Sweet Life Cafe in Oak Bluffs on Martha's Vineyard. The First Lady completed her date night look with diamond hoop earrings and a matching tote.

    Jewel Samad, AFP/Getty Images

    En route to Martha's Vineyard for vacation, First Lady Michelle Obama chose this striped Sophie Theallet dress, last seen during their family trip to Ghana. She completed her look with dark sunglasses and metallic ballet flats.

    Alex Brandon, AP

    Returning from a holiday out west that included stops in Montana, Wyoming, Colorado, and Arizona on August 17, First Lady Michelle Obama walks across the White House lawn with daughter Malia in this cap sleeve Maria Pinto "Eula Stripe Maggie" dress.

    Win McNamee, Getty Images

    Who wears short shorts? You know who! While touring Hopi Point at the Grand Canyon National Park in Arizona on August 16, the First Lady opted for this casual cool look.

    Mandel Ngan, AFP / Getty Images

    Landing at Sky Harbor Airport in Phoenix, Arizona on August 15 with daughter Sasha, Michelle Obama wears this printed Merona dress from Target with a Sacai belt.

    Mandel Ngan, AFP / Getty Images