Kerrang! Dot Com can exclusively reveal that shock rocker Marilyn Manson has been added to the bill of this year's K!-sponsored Download festival.Also on the bill will be K! faves Killswitch Engage and legendary Texan rockers ZZ Top!The three-day festival, which takes place at Donington Park on June 12, 13 and 14, will also see appearances from Def Leppard, DevilDriver, DragonForce, Korn, Limp Bizkit, Motley Crue, Pendulum, The Prodigy, Slipknot, Trivium and Whitesnake.Who do you thinks gonna rock the hardest? Click here to vote in the K! Dot Com poll.