First Lady Michelle Obama celebrated the re-election of President Barack Obama Tuesday night in a purple Michael Kors silk dress that she coordinated with a black cardigan and black shoes.

Mrs. Obama celebrated with the President and their daughters Malia and Sasha at their election night victory rally in Chicago.

Mrs. Obama has worn the same dress in the past in 2009 for a holiday party and in 2010 for a military event, according to the Huffington Post.

According to People Magazine, she decided for it at the last minute.

"She said that she was so busy with the campaign and their kids that she had no time to think about an outfit and decided at the last minute," a source told People.

Kors is one of her favorite designers. In 2009 Mrs. Obama also wore a black sleeveless Kors dress to pose for a White House portrait in 2009.

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