Michelle Obama & Margarita Zavala At Mexico's State Dinner: Whose Dress Do You Like Best? (PHOTO, POLL)

President Barack Obama and first lady Michelle Obama pose for a photo with Mexican President Felipe Calderon and his wife Margarita Zavala after they arrived for the State Dinner at the North Portico of the White House in Washington, Wednesday, May 19, 2010. (AP Photo/Charles Dharapak)

Mrs. Obama's gown was by Peter Soronen.