Beyonce's proudest moment ever? After singing "At Last" for President Barack Obama four years ago at an inaugural ball, the 31-year-old Grammy winner was front and center in front of the U.S. Capitol on Monday Jan. 21 for the ultimate singing honor: Crooning the National Anthem in front of Obama immediately following his swearing-in and speech at the inauguration.

Stunning with blonde waves, emerald jewelry and a regal, sequined black coat, the singer and mom approached the podium to belt out "The Star Spangled Banner." At one point in the performance, Beyonce removed her earpiece, suggesting a problem with the audio -- but her rousing rendition of the classic patriotic song drew cheers and applause from the huge crowd.

Watch Beyonce sing the national anthem now!