Christina Aguilera is at the center of some heated controversy for flubbing a few lines during her rendition of the national anthem at Sunday's Super Bowl XLV. Fergie, who performed with the rest of the Black Eyed Peas during halftime of the Pittsburgh Steelers and Green Bay Packers championship game, has come to the pop star's defense, emphasizing the pressure to entertain at such a high-profile gig.

"You know what? It's such a huge venue, your nerves take a hold of you," Fergie said during sportscaster Dan Patrick's radio show. "I completely understand. She's one of the best singers of our time. Nobody can take that away from you. ... But you get nervous at these things. We're human."

Aguilera ran into some trouble early on in her rendition of the patriotic tune by singing "What so proudly we watched at the twilight's last reaming," instead of "O'er the ramparts we watched, were so gallantly streaming." Shortly after the NFL broadcast, the songstress apologized in a statement that read: "I got so caught up in the moment of the song that I lost my place. I can only hope that everyone could feel my love for this country and that the true spirit of its anthem still came through."

Fergie also addressed the imperfections in her own halftime performance, which included special appearances by Usher and Slash. "Some of my notes were pitchy to me," the starlet admitted. "It was so exhilarating. The whole thing. It was so big. That's a once-in-a-lifetime thing."

Do you agree with Fergie's argument about Christina's anthem? Let us know in the comments!