Pearl Jam front-man Eddie Vedder played cowbell and sang backing vocals with Queens of the Stone Age on their song Little Sister at Lollapalooza Chile over the weekend.  Queens of the Stone Age played prior to Pearl Jam on Saturday.

The song comes from the band's 2005 Lullabies to Paralyze album.  Queens of the Stone Age will release their new album on June 4th.  At Lollapalooza Brazil last week, the band debuted one of the songs from that album, My God is the Sun.