Queen + Adam Lambert have begun rehearsing ahead of their upcoming one-off date in Las Vegas this weekend.

The iconic British rockers and the 'Trespassing' star are due to play the MGM Grand on Friday (September 20) for the iHeart Radio Music Festival.

Lambert has now revealed that the two camps are practising together for the show, tweeting:

"1st day of rehearsal w @QueenWillRock for our iHeart Radio set Friday. What a treat to once again share stage w Rock Royalty."

The singer has previously fronted Queen a number of times in the past, including during a series of shows in London last year.