Rapper opens up about progress being made on his forthcoming third studio album
US star raps along to tracks including 'My Name Is' and 50 Cent's 'Candy Shop'
Rapper Future also appears on new song
Lamar's third album is set for release this autumn
LA rapper performs cover version at first ever iHeartMusic Awards last night (May 1)
Alicia Keys and Hans Zimmer also join the rapper on Fallon
Prosecutors claim the athlete argued with girlfriend Reeva Steenkamp over 'Bitch Don't Kill My Vibe'
US rapper's last album, 'Good Kid, M.A.A.D City', was released in 2012
Vanilla Ice also made a surprise appearance at the event
Rapper teams up with the rock band on their hit track 'Radioactive'