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Sightings of stars included Paris and Nicky Hilton, Kelly Osbourne, Mischa Barton, Pink, Dave Grohl, Camilla Belle, Kristin Cavallari, Chris Klein, Kate Bosworth, Drea De Matteo and Danny DeVito, according to Perez Hilton.
On Friday, Beyoncé joined husband Jay-Z on stage and shocked the audience at the festival after wearing a t-shirt covered with obscenities.
