Republic of Korea first lady Kim Yoon-ok, U.S. first lady Michele Obama, South Korean President Lee Myung-bak and U.S. President Barack Obama pose on the North Portico of the White House. (Alex Wong/Getty Images)

Here’s our first look at the presidential couples dressed for tonight’s state dinner. Michelle Obama selected a deep purple one-shouldered dress by Korean-American designer Doo-Ri Chung.

Updated, 9:30: Doo-Ri Chung talks about her state dinner dress for Michelle Obama

11 p.m.: State dinner fashion: What the guests wore

[Read earlier: State dinner for South Korea guest list, 6:29 p.m.; State dinner menu, entertainment, 5:40 p.m.; State dinner for Korea preview: Michelle Obama’s dresses; a history of state dinners, 1013/11; State dinner guest David Kim, and how he almost missed it, 10/12/11; White House state dinner for Korea: We try to guess the guests, 10/5/11]

See a gallery of Michelle Obama’s diplomatic fashion. . .