Arctic Monkeys were joined on stage by Queens of the Stage frontman Josh Homme during their gig at the Wiltern in Los Angeles earlier this week, NME reports. The towering frontman joined Alex Turner and co. for a performance of "Knee Socks," taken from Arctic Monkeys new album AM," on Tuesday (October 1). Homme was not formally introduced by the band, choosing instead to walk onto the stage half way through the song and provide backing vocals on the final song in the band's set. Earlier this year Alex Turner provided vocals on Queens of the Stone Age's "...Like Clockwork" while Homme appears on "One for the Road" and "Knee Socks" on "AM." Alex Turner and co recently made Official UK Albums Chart history with 'AM', released by Domino Records, becoming the band's fifth consecutive Number One and the first indie-released act to achieve such a feat.