Singing star Christina Aguilera had the eyes of the world on her as she sang the American National Anthem to kick off the Super Bowl XLV but she ended up changing an entire line of the song during her performance which was watched by millions.

Aguilera was singing the anthem at the Dallas Cowboys home stadium in Arlington Texas where the Green bay Packers faced the Pittsburgh Steelers but she ran into trouble when it came to the exact words of the anthem.

Instead of singing “O´er the ramparts we watched, were so gallantly streaming” she instead put in her own line singing “What so proudly we watched at the twilight's last gleaming.”

In a statement Christina Aguilera said: “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 the anthem still came through.”

Although forgetting the words to the “Star Spangled Banner” maybe one of the most embarrassing on stage experiences for any singer, she is far from the first to falter under the pressure and joins the likes of Jesse McCartney who forget several verses when he sang the anthem at a NASCAR event in 2009 while Michael Bolton had to check the lyrics written on his hand to complete the song.

While Christina will have to hide her blushes after the mistake there were other problems on the evening that left fans unable to watch the game.

It is reported that 850 fans were unable to sit in the seats that they had paid for while a further 400 were unable to get into the stadium at all. They will however be compensated to the value of three times he cost of the ticket price.

Problems on the evening were put down to a winter storm in the city which threw organisers into trouble as they battled against freezing temperatures.

In the end though fans of the Green Bay Packers will not be complaining as their team took the title for the fourth time beating Pittsburgh by 31-25.