The pop singer said Friday she cannot wait to perform. She says: "I'm pumped just thinking about that huge audience and soaking up their energy."
U.S. & World
Stories that affect your life across the U.S. and around the world.
She joined about 140,000 music fans at the festival in southwest England's Somerset in 2008 to see Jay-Z's show.
The outdoor festival, one of the largest and best-known of its kind, celebrated its 40th anniversary last year. Tickets for this year's event on June 22-26 already have sold out.
Copyright 2011 by Associated Press. All rights reserved.This material may not be published, broadcast, rewritten or redistributed.
Related Content from AccessHollywood.com:
VIEW THE PHOTOS: 2009 Golden Globes Fashion Trend: Strapless Gowns
VIEW THE PHOTOS: 'Dreamgirls'