It's that time again! On Wednesday night the Obamas will host Mexican President Felipe Calderon and his wife Margarita Zavala for what will hopefully be a Salahi-free state dinner at the White House. While the big question is "Will there be any party crashers?," the event's second great suspense is "What will Michelle Obama wear?"
Just as we did before Indian state dinner, here's a look back at what former first ladies have donned for this formal occasion (with a little Michelle Obama in Naeem Khan thrown in). As always, vote for your favorite.