Beyonce lip-syncs the National Anthem

(via USATODAY)

Pop star Beyonce wowed audiences with her rendition of 'The Star Spangled Banner' at Obama's Inauguration on Monday.

However, views of the star's performance are now changing after speculation that the star may have lip-synced.

Kristin DuBois, a spokeswoman for the Marine Corps Band, told reporters that Beyonce did not sing live at the Inauguration.

"All music is pre-recorded for the ceremony because there are so many eventualities and conditions that day, said DuBois. "We performed live, the band. But, we received last-minute word that Beyonce was going to use the pre-recorded vocal track. Those were the instructions we were given. We don't know what the reason why."

Beyonce has not commented on her performance.