Singer Adam Lambert has announced he will perform with British rock group Queen.

“As many suspected, I can finally confirm: I have been invited by Queen to sing one very special concert! Sonisphere at Knebworth July 17th!” Lambert tweeted to his more than 1.3 million followers. “Sorry to be coy about the details the past few weeks, but I made a promise to keep it under wraps as best I could. Gonna be a surreal night!”

The 30-year-old Lambert first discussed joining Queen at the Sonisphere Festival in England in comments made to the UK's Daily Star.

“The intention is to pay tribute to Freddie [Mercury] and the band by singing some fucking great songs,” he said. “It's to keep the music alive for the fans and give it an energy that Freddie would have been proud of.”

His comments sparked rumors that he would join the iconic rock band, which currently includes guitarist Brian May and drummer Roger Taylor. Taylor and May formed the band Smile, which Freddie Mercury altered to Queen when he joined. Mercury died in 1991 of complications due to AIDS.

“I haven't confirmed any guest appearances,” Lambert tweeted earlier this month. “I was talking about the EMAs”

Lambert performed several songs with Queen at last year's MTV European Music Awards (EMA) in Belfast.