New Jersey Gov. Chris Christie sits next to first lady Michelle Obama as President Barack Obama welcomed the governors of the National Governors Association to the 2013 Governors� Dinner at the White House in Washington, Sunday, Feb. 24, 2013. (AP Photo/Susan Walsh)

WASHINGTON (AP) — Michelle Obama made a surprise appearance at the Oscars, opening the envelope that contained the name of the Best Picture winner, "Argo."

Appearing via streaming video from the White House, Mrs. Obama said all of the nominees demonstrated that "we can overcome any obstacle."

She said that message is "especially important for our young people" and thanked Hollywood for encouraging children "to open their imaginations."

The first lady was introduced by Jack Nicholson, who noted that the Best Picture trophy is usually announced solo.

Mrs. Obama wore a silver, art deco-inspired gown by Indian-born American fashion designer Naeem Khan. It was the same dress she wore for the Obamas' dinner with the nation's governors at the White House Sunday night.
Associated Press
Copyright 2013 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.