Update: See a slideshow of more first lady fashion at Friday night's NATO dinner and concert.

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The meeting of first lady fashion forces Carla Bruni-Sarkozy and Michelle Obama has been one of the most highly anticipated get-togethers of the Obamas' European trip this week.

Bruni-Sarkozy was interviewed inside the Michelle Obama issue of Vogue in March, telling the magazine that she hates makeup, clothes and jewelry. Nevertheless, as a former supermodel she's become an...