James Blake and The Hives are among the latest acts confirmed for the Thursday of Belgium's biggest music festival.
BBC Sound of 2011 runner up James Blake has received much critical acclaim since the release of his experimental electronic self-titled album.
Joining Blake and The Hives on the opening night of the festival are Anouk, Evaline and rap-collective OFWGKTA.
Rock Werchter 2011 festival takes place across two stages from Thursday June 30 to Sunday July 3.
Tickets are on sale now at 195 € for a four-day pass, with camping available for an additional 18 €.
Also confirmed for the Rock Werchter 2011 line up are Iron Maiden, Coldplay, Kings Of Leon and The Black Eyed Peas.