The artists join the previously announced stage headliners At The Drive-In, The Maccabees and Justice.
© PA Images
© Bestival 2011/Louise Roberts
Other acts added to the bill include Mastodon, Passion Pit, Mark Lanegan Band, The Hives, Spector, Dry The River and Tribes.
This year's Reading and Leeds Festivals are headlined by The Cure, Foo Fighters and Kasabian.
Earlier this week, the lineup for the festival's Lock Up Stage was announced, including Social Distortion, Anti-Flag, Less Than Jake and Gallows.
This year's Reading and Leeds Festivals take place over the Bank Holiday Weekend on August 24-26.
> Justin Bieber, Jedward, ABBA on spoof Reading, Leeds Festival poster
Watch the Graham Coxon 'Ooh, Yeh Yeh' music video below:
