The cast of Glee did a command performance of "Don't Stop Believing" at the White House.
Amber Riley (who's new twitter name is @MsAmberPRiley ) also sang the national anthem from the balcony of the White House next to the first family.
(Updated: Here's some AP clips)
Video of the performance can be found here or below.
Also, the Glee cast filmed a special episode of Oprah over Easter weekend. The episode is to air on the Oprah Show April 7th.