Green Day has announced that Kaiser Chiefs and All Time Low will be opening up for them next June in London. The show at Emirates Stadium, June 1, 2013, was announced in August when Green Day visited Zane Lowe on BBC Radio One.
All Time Low recently opened for Green Day during their shows in Germany this summer. They've been fans of Green Day for a while, here's a video of them covering "Brain Stew" back in 2010. Kaiser Chiefs previously opened for Green Day during the 2009 North American tour.
Green Day last played in London at the end of August where they performed at Shepards Bush Empire.
A full list of Green Day's upcoming tour dates can be found here.