Queen's Brian May and Roger Taylor confirmed Tuesday that the American singer-songwriter will perform vocals for the band's headline set on the second day of the Sonisphere 2012 rock festival. The concert takes place July 7 at Knebworth Park in Stevenage, north of London.
Lambert, 30, has sung with Queen before. In 2009 he performed "We Are the Champions" on the U.S. reality show that made his name and then last November he sang an eight-minute set at the MTV Europe Awards to celebrate Queen's Global Icon Award.
Freddie Mercury's final concert with Queen also took place at Knebworth, in August 1986.