Music
The 'All About You' hitmakers also performed at the annual pop extravaganza in 2004, 2006 and 2007.
Soul singer Adele, electro-popper Sam Sparro and indie stars Pigeon Detectives have also been added to the lineup.
They join five other acts, including The Feeling and Robyn, who were added to the bill last month.
The event, to be broadcast live on Channel 4, takes place in Weston-super-Mare, Somerset on July 20.
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