London: Hollywood star Brad Pitt is refusing to reveal his bare bottom in his latest movie “Curious Case of Benjamin Button” and is asking producers to find a double to replace his rear. The hunky actor, who showed off his naked behind in 2004 hit flick “Troy”, is refusing the repeat the feat, reported contactmusic.com. An informed source said: “Casting notices have been put out looking for suitable rears. Maybe Pitt’s partner Angelina Jolie doesn’t want him stripping off for anyone else these days.”