The 29-year-old said she is going to put on quite a show at Sunday's ceremony.
Christina will be performing a number from her upcoming film Burlesque.
She told MTV News: 'It's going to be fantastic and it will give you a fitting little look inside the movie.'
'It will be another very new challenge for me, my legs have been incredibly sore as I stepped into the role of Ali for this.'
In the flick Aguilera plays Ali - a girl with big dreams who stumbles on a burlesque club.
She added: 'You're going to get quite the show, quite the spectacle.'