Adam Lambert to perform with Queen at Sonisphere
Adam Lambert is set to perform with Queen at the 2012 Sonisphere festival.
Lambert, who came second in the 2009 series of American Idol, will headline the Saturday evening with guitarist Brian May and drummer Roger Taylor.
Evanescence, Marilyn Manson, Cypress Hill, The Blackout and Faith No More have also been added to the line-up.
Kiss will headline the Friday evening at the festival, which takes place at Knebworth Park, Stevenage on 6-8 July.
Lambert last performed with Queen at the MTV Europe Music Awards in November.
Fans and critics reacted positively to the collaboration, which sparked rumours of more joint projects in the future.
Queen's former lead singer Freddie Mercury died in 1991.
Brian May said: "Judging by my incoming mail, this decision will make a lot of people very happy. It's a worthy challenge for us, and I'm sure Adam would meet with Freddie's approval."
Lambert added: "I'm completely in awe of the Queen phenomenon. The thought of sharing the stage for a full set is so beautifully surreal.
"I'm honoured to be able to pay my respects to Freddie's memory. He's a personal hero of mine and I am deeply grateful for the chance to sing such powerful music for fans of this legendary band."
Queen's final concert with Mercury was in Knebworth in 1986.
Other acts added to the Sonisphere line-up include The Darkness, Incubus, Refused, Ghost, Flogging Molly and musical comedian Tim Minchin.
Tickets for Sonisphere are available from Thursday 23 February.