First lady Michelle Obama arrived at Thursday's White House state dinner for the president of South Korea looking stunning in a one-shoulder purple gown designed by the Korean-American designer Doo-Ri Chung.

The event was in honor of President Lee Myung-bak and his wife, Kim Yoon-ok. On Thursday, President Barack Obama and Lee discussed a long-sought trade deal as an engine for job creation in both countries and presented a united front in the North Korean nuclear standoff.

Michelle Obama looked spectacular as she welcomed guests for the state dinner. The bold color of her gown, along with her jewel tones, made her look trendy and stylish.

The Huffington Post reported that the first lady must have given much thought to choosing her dress for this evening considering the criticism she faced when she when she wore a dress by British designer Alexander McQueen to the state dinner for Chinese President Hu Jintao.

Earlier during the day, at the arrival ceremony, Michelle Obama kept it simple in a smart suit with a jacket from the Chris Benz resort collection.

Take a look at the stunning images of Michelle Obama at the state dinner in the slideshow given: