Leonardo prepares for the bombshell headlines…

...which is fair enough, because no one's going to print the full title. DiCaprio has signed to star in Bombshell: The Secret Story of America's Unknown Atomic Spy Conspiracy. Or BTSSOAUASC, as it'll be handily known. He'll play Theodore Hall, a biophysicist who was a key member of the atomic bomb development team. Controversy dogs Hall, who some accuse of single-handedly starting the Cold War by giving secrets to the Russians. He took no money and claimed he did it to ensure nuclear parity. Sounds quite a corker, but did Theodore have an affair with a beautiful woman during all this? We bet he did...