Michelle Obama Stuns in Marchesa

U.S. President Barack Obama, right, and first lady Michelle Obama walk to greet David Cameron, U.K. prime minister, and his wife Samantha Cameron on the North Portico of the White House in Washington, D.C., U.S., on Wednesday, March 14, 2012. Obama and Cameron showed a united front on finishing the war in Afghanistan and pressing for change in Iran and Syria, seeking to consolidate international support before a North Atlantic Treaty Organization meeting in May. Photo: Joshua Roberts/Bloomberg/Getty Images

Michelle Obama wore a teal, off-the-shoulder gown by Marchesa to the state dinner last night, accessorized with strands of Tom Binns necklaces. Earlier in the day, she hosted a preview of the event, in a gray Zac Posen dress and a Saloni brooch. See both of these outfits in our Michelle Obama Look Book.