Los Angeles - Beyoncé has been rehearsing for the Super Bowl for three months.
The Diva singer - who was criticised last week for singing the American national anthem with a backtrack at President Barack Obama's inauguration - has reportedly been preparing to perform live at the high profile sporting event in New Orleans on Sunday since the end of October.
A source close to the halftime show told E! Online: "Rehearsals typically go on for two to three months in advance" and explained that the 31-year-old singer was likely to have signed a deal to perform at the event in mid-2012.
Beyoncé is not being paid to perform at the event but her production costs, which are estimated to be in the region of $600 000, will be covered and her show is being sponsored as part of her $50m deal with Pepsi.
Beyoncé is reportedly feeling the pressure to wow next weekend despite believing she did nothing wrong at Obama's inaurguration.
A source close to the singer said she was very disappointed and felt "a technicality which everybody does took away from the beauty of the moment.
"She didn't think there was anything wrong with it. Pavarotti has done it! It was freezing out, and if she messed up just one note, that would have been the story.
"Everybody uses these tracks, and the music director advised it. Any big outdoor live performance is almost always with some kind of track.
"She did sing, but used a track."