Singer Adam Lambert and British rock group Queen have scheduled a second performance to take place in Moscow.

Lambert last week announced he would be joining the band for one performance.

“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, 30, 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!”

On Tuesday, Queen announced a second date.

Lambert will join the legendary rock band on June 30th at Moscow's Olympic Arena.

“These two shows are the only concerts presently planned for Queen and Lambert in 2012,” the group said in a statement.

Lambert's earlier comments with the UK's Daily Star sparked rumors that he would join Queen, 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.

During an interview with NME, Lambert insisted he's not trying to replace Mercury.

“The way I look at it is I'm not trying to imitate or outdo him or compete in any way, that's not even in my mind at all,” Lambert said. “I think it's really an honor to be asked to sing the music that he and the band wrote and get up there and put on a good show. If people are too busy trying to compare, they're not going to enjoy the music.”

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