As the 2013 Presidential Inauguration kicked off, thousands of attendees patiently weathered the cold on the National Mall, not only for a glimpse of President Obama and his family, but perhaps equally importantly, to stand in the presence of Beyoncé.

The 31-year-old singer, better known to the Twittersphere as “Queen Bey,” took the podium at around 12:30 p.m. on Monday to thunderous applause, and instantaneously earned rave reviews on Twitter for her rendition of the National Anthem.

In an interview two days before her performance, a humble Beyoncé revealed in an interview with Zap2It that she was still practicing for the big event.

"I can't really think about it until it is over," she said. "It is too much! There is no way I would be able to sing."

Although the vocal Obama supporter had previously serenaded the President with her performance of the Etta James classic “At Last” for his 2008 inaugural ball, and had also sang the National Anthem at the 2004 Superbowl, she said that she was still rehearsing to get it just right.

"I know it," she said, referring to the National Anthem, "but it is the type of thing doesn't matter how many times you sing it. And the biggest fear is making sure you sing it right, and sing it correctly."

"I am practicing," Beyoncé said. "I have the tour, the Super Bowl and National Anthem. I am rehearsing right now. I feel like I love this song. Of course it is really emotional and nothing is more emotional than when singing it for a cause, and I know -- the day after tomorrow. I don't want to think about it! I love the song because the melody is so beautiful, and you have so many choices. I want to keep it really elegant."

Check out the audio clip below to hear Beyoncé rehearsing the National Anthem in soundcheck.