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The 19-year-old will perform Coldplay's 'God Put A Smile On Your Face' with Mark Ronson at the ceremony at London's Earls Court.
She told the Daily Star: "I'm sh***ing it about the awards. I'm worried I'm gonna fall on my face on the way up to collect the award or something."
However, she said she was excited at the prospect of performing at the event, saying: "I can't wait to sing, though. I'm doing a tune with Mark Ronson in his medley. And I'm getting to wear diamonds - real ones! Big ones!"
She recently said she is desperate for Amy Winehouse to make it to the ceremony, which will be hosted by Ozzy and Sharon Osbourne.
The awards show airs tomorrow at 8pm on ITV1.
