2011 Frankfurt Auto Show

A hostess leans on the Alfa Romeo Concept Car 4C during the press day of the Frankfurt Auto Show IAA in Frankfurt, Germany, Tuesday, Sept. 13, 2011. The fair opens its doors to the public Sept. 15 to Sept. 25, 2011. (Yahoo! Autos Photo/Roberto Kerian)

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The world's biggest auto show runs through September 25.

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