Christina Aguilera Sings National Anthem at Super Bowl XLV Christina Aguilera, always a pro singing the national anthem, couldn't make it through 'The Star-Spangled Banner' before the kickoff of Super Bowl XLV. Aguliera, who has handled the task without issue before NBA games, botched the lyrics badly halfway through the song.

Instead of "O'er the ramparts we watched were so gallantly streaming" turned into "what so proudly we watched at the twilight's last [unintelligable lyric]."

Luckily, Aguilera had the quick, crowd-rousing "rocket's red glare" line to follow it up, which she nailed and got the packed Cowboys Stadium quickly on her side.

Still, our eyewitnesses in Dallas tell us that the crowd had some drastic reactions. "This was the biggest performance of her career and she blew it," a source with a VIP view tells me. "To mess up the lyrics was a disaster."